diff --git a/app/build.gradle b/app/build.gradle
index c13f19a1..2fb770d0 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -168,13 +168,19 @@ dependencies {
     // Libraries used for legacy View-based UI
     implementation "androidx.constraintlayout:constraintlayout:2.2.0-alpha09"
     implementation 'com.github.MikeOrtiz:TouchImageView:3.3'
+    implementation "androidx.appcompat:appcompat:1.7.0-alpha02"
 
     // JDK Desugaring - polyfill for new Java APIs
     coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:2.0.3'
 
     // Markdown
     implementation "com.github.discord:SimpleAST:2.7.0"
-    implementation "androidx.appcompat:appcompat:1.7.0-alpha02"
+
+    // AndroidX Media3 w/ ExoPlayer
+    implementation "androidx.media3:media3-exoplayer:$media3_version"
+    implementation "androidx.media3:media3-exoplayer-hls:$media3_version"
+    implementation "androidx.media3:media3-datasource-okhttp:$media3_version"
+    implementation "androidx.media3:media3-ui:1.0.1"
 }
 
 kapt {
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 1e96b0ff..aad60517 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -80,6 +80,11 @@
             android:name=".activities.media.ImageViewActivity"
             android:theme="@style/Theme.Revolt" />
 
+        <activity
+            android:name=".activities.media.VideoViewActivity"
+            android:configChanges="orientation|screenSize"
+            android:theme="@style/Theme.Revolt" />
+
     </application>
 
 </manifest>
\ No newline at end of file
diff --git a/app/src/main/java/chat/revolt/activities/media/ImageViewActivity.kt b/app/src/main/java/chat/revolt/activities/media/ImageViewActivity.kt
index 38b8d3c1..debb836a 100644
--- a/app/src/main/java/chat/revolt/activities/media/ImageViewActivity.kt
+++ b/app/src/main/java/chat/revolt/activities/media/ImageViewActivity.kt
@@ -1,9 +1,7 @@
 package chat.revolt.activities.media
 
 import android.content.ContentValues
-import android.content.Context
 import android.content.Intent
-import android.net.Uri
 import android.os.Build
 import android.os.Bundle
 import android.provider.MediaStore
@@ -42,21 +40,18 @@ import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.viewinterop.AndroidView
-import androidx.core.content.FileProvider
-import androidx.lifecycle.ViewModel
-import androidx.lifecycle.viewmodel.compose.viewModel
 import chat.revolt.R
 import chat.revolt.api.REVOLT_FILES
 import chat.revolt.api.RevoltHttp
 import chat.revolt.api.schemas.AutumnResource
 import chat.revolt.api.settings.GlobalState
 import chat.revolt.components.generic.PageHeader
+import chat.revolt.provider.getAttachmentContentUri
 import chat.revolt.ui.theme.RevoltTheme
 import com.bumptech.glide.Glide
 import io.ktor.client.request.get
 import io.ktor.client.statement.readBytes
 import kotlinx.coroutines.launch
-import java.io.File
 
 class ImageViewActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -81,36 +76,11 @@ class ImageViewActivity : ComponentActivity() {
     }
 }
 
-class ImageViewScreenViewModel : ViewModel() {
-    suspend fun getAttachmentContentUri(
-        context: Context,
-        resourceUrl: String,
-        id: String,
-        filename: String
-    ): Uri {
-        val attachmentsDir = File(context.cacheDir, "attachments")
-        if (!attachmentsDir.exists()) {
-            attachmentsDir.mkdir()
-        }
-
-        val response = RevoltHttp.get(resourceUrl)
-        val file = File(attachmentsDir, "$id-$filename")
-        file.writeBytes(response.readBytes())
-
-        return FileProvider.getUriForFile(
-            context,
-            "chat.revolt.fileprovider",
-            file
-        )
-    }
-}
-
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun ImageViewScreen(
     resource: AutumnResource,
-    onClose: () -> Unit = {},
-    viewModel: ImageViewScreenViewModel = viewModel()
+    onClose: () -> Unit = {}
 ) {
     val resourceUrl = "$REVOLT_FILES/attachments/${resource.id}/${resource.filename}"
 
@@ -144,15 +114,13 @@ fun ImageViewScreen(
         shareSubmenuIsOpen.value = false
 
         coroutineScope.launch {
-            val contentUri = viewModel.getAttachmentContentUri(
+            val contentUri = getAttachmentContentUri(
                 context,
                 resourceUrl,
                 resource.id!!,
                 resource.filename ?: "image"
             )
 
-            Log.d("ImageViewActivity", "Content URI: $contentUri")
-
             val intent =
                 Intent(Intent.ACTION_SEND)
             intent.type = resource.contentType ?: "image/*"
diff --git a/app/src/main/java/chat/revolt/activities/media/VideoViewActivity.kt b/app/src/main/java/chat/revolt/activities/media/VideoViewActivity.kt
new file mode 100644
index 00000000..61c0f207
--- /dev/null
+++ b/app/src/main/java/chat/revolt/activities/media/VideoViewActivity.kt
@@ -0,0 +1,283 @@
+package chat.revolt.activities.media
+
+import android.content.ContentValues
+import android.content.Intent
+import android.os.Build
+import android.os.Bundle
+import android.provider.MediaStore
+import android.util.Log
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.compose.setContent
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.DropdownMenu
+import androidx.compose.material3.DropdownMenuItem
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.SnackbarDuration
+import androidx.compose.material3.SnackbarHost
+import androidx.compose.material3.SnackbarHostState
+import androidx.compose.material3.SnackbarResult
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.RectangleShape
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.viewinterop.AndroidView
+import androidx.media3.common.MediaItem
+import androidx.media3.exoplayer.ExoPlayer
+import androidx.media3.ui.PlayerView
+import chat.revolt.R
+import chat.revolt.api.REVOLT_FILES
+import chat.revolt.api.RevoltHttp
+import chat.revolt.api.schemas.AutumnResource
+import chat.revolt.api.settings.GlobalState
+import chat.revolt.components.generic.PageHeader
+import chat.revolt.provider.getAttachmentContentUri
+import chat.revolt.ui.theme.RevoltTheme
+import io.ktor.client.request.get
+import io.ktor.client.statement.readBytes
+import kotlinx.coroutines.launch
+
+class VideoViewActivity : ComponentActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        val autumnResource = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            intent.getParcelableExtra("autumnResource", AutumnResource::class.java)
+        } else {
+            @Suppress("DEPRECATION")
+            intent.getParcelableExtra("autumnResource")
+        }
+
+        if (autumnResource?.id == null) {
+            Log.e("VideoViewActivity", "No AutumnResource provided")
+            finish()
+            return
+        }
+
+        setContent {
+            VideoViewScreen(resource = autumnResource, onClose = { finish() })
+        }
+    }
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@androidx.annotation.OptIn(androidx.media3.common.util.UnstableApi::class)
+@Composable
+fun VideoViewScreen(
+    resource: AutumnResource,
+    onClose: () -> Unit = {}
+) {
+    val resourceUrl = "$REVOLT_FILES/attachments/${resource.id}/${resource.filename}"
+
+    val context = LocalContext.current
+    val coroutineScope = rememberCoroutineScope()
+    val activityLauncher = rememberLauncherForActivityResult(
+        ActivityResultContracts.StartActivityForResult()
+    ) {}
+
+    val shareSubmenuIsOpen = remember { mutableStateOf(false) }
+    val snackbarHostState = remember { SnackbarHostState() }
+
+    fun shareUrl() {
+        shareSubmenuIsOpen.value = false
+
+        val intent =
+            Intent(Intent.ACTION_SEND)
+        intent.type = "text/plain"
+        intent.putExtra(
+            Intent.EXTRA_TEXT,
+            resourceUrl
+        )
+
+        val shareIntent = Intent.createChooser(intent, null)
+        activityLauncher.launch(shareIntent)
+    }
+
+    fun shareVideo() {
+        shareSubmenuIsOpen.value = false
+
+        coroutineScope.launch {
+            val contentUri = getAttachmentContentUri(
+                context,
+                resourceUrl,
+                resource.id!!,
+                resource.filename ?: "video"
+            )
+
+            val intent =
+                Intent(Intent.ACTION_SEND)
+            intent.type = resource.contentType ?: "video/*"
+            intent.putExtra(
+                Intent.EXTRA_STREAM,
+                contentUri
+            )
+
+            val shareIntent = Intent.createChooser(intent, null)
+            activityLauncher.launch(shareIntent)
+        }
+    }
+
+    fun saveToGallery() {
+        coroutineScope.launch {
+            context.applicationContext.let {
+                it.contentResolver.insert(
+                    MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
+                    ContentValues().apply {
+                        put(MediaStore.Video.Media.DISPLAY_NAME, resource.filename)
+                        put(MediaStore.Video.Media.MIME_TYPE, resource.contentType)
+                        put(MediaStore.Video.Media.RELATIVE_PATH, "Movies/Revolt")
+                        put(MediaStore.Video.Media.IS_PENDING, 1)
+                    }
+                )
+            }?.let { uri ->
+                context.contentResolver.openOutputStream(uri).use { stream ->
+                    val video = RevoltHttp.get(resourceUrl).readBytes()
+                    stream?.write(video)
+
+                    context.applicationContext.let {
+                        it.contentResolver.update(
+                            uri,
+                            ContentValues().apply {
+                                put(MediaStore.Video.Media.IS_PENDING, 0)
+                            },
+                            null,
+                            null
+                        )
+                    }
+
+                    val snackbar = snackbarHostState.showSnackbar(
+                        message = context.getString(R.string.video_viewer_saved),
+                        actionLabel = context.getString(R.string.video_viewer_open),
+                        duration = SnackbarDuration.Short
+                    )
+
+                    if (snackbar == SnackbarResult.ActionPerformed) {
+                        val intent = Intent(Intent.ACTION_VIEW)
+                        intent.setDataAndType(uri, resource.contentType)
+                        intent.flags = Intent.FLAG_GRANT_READ_URI_PERMISSION
+                        activityLauncher.launch(intent)
+                    }
+                }
+            }
+        }
+    }
+
+    val player = remember {
+        ExoPlayer.Builder(context).build().apply {
+            setMediaItem(MediaItem.fromUri(resourceUrl))
+            prepare()
+            play()
+        }
+    }
+
+    DisposableEffect(player) {
+        onDispose {
+            player.release()
+        }
+    }
+
+    RevoltTheme(requestedTheme = GlobalState.theme) {
+        Scaffold(
+            snackbarHost = { SnackbarHost(hostState = snackbarHostState) },
+        ) { pv ->
+            Surface(
+                modifier = Modifier
+                    .padding(pv)
+                    .background(MaterialTheme.colorScheme.background)
+                    .fillMaxSize()
+            ) {
+                Column {
+                    PageHeader(text = stringResource(
+                        id = R.string.video_viewer_title, resource.filename ?: resource.id!!
+                    ),
+                        showBackButton = true,
+                        onBackButtonClicked = onClose,
+                        maxLines = 1,
+                        additionalButtons = {
+                            Row {
+                                IconButton(onClick = {
+                                    shareSubmenuIsOpen.value = true
+                                }) {
+                                    Icon(
+                                        painter = painterResource(id = R.drawable.ic_share_24dp),
+                                        contentDescription = stringResource(id = R.string.share)
+                                    )
+                                }
+
+                                DropdownMenu(
+                                    expanded = shareSubmenuIsOpen.value,
+                                    onDismissRequest = {
+                                        shareSubmenuIsOpen.value = false
+                                    }) {
+                                    DropdownMenuItem(
+                                        onClick = {
+                                            shareUrl()
+                                        },
+                                        text = {
+                                            Text(stringResource(id = R.string.video_viewer_share_url))
+                                        }
+                                    )
+                                    DropdownMenuItem(
+                                        onClick = {
+                                            shareVideo()
+                                        },
+                                        text = {
+                                            Text(stringResource(id = R.string.video_viewer_share_video))
+                                        }
+                                    )
+                                }
+
+                                IconButton(onClick = {
+                                    saveToGallery()
+                                }) {
+                                    Icon(
+                                        painter = painterResource(id = R.drawable.ic_download_24dp),
+                                        contentDescription = stringResource(id = R.string.video_viewer_save)
+                                    )
+                                }
+                            }
+                        })
+
+                    Box(
+                        modifier = Modifier
+                            .clip(RectangleShape)
+                            .fillMaxSize()
+                    ) {
+                        AndroidView(
+                            factory = { context ->
+                                PlayerView(context).apply {
+                                    setShowBuffering(PlayerView.SHOW_BUFFERING_ALWAYS)
+                                }
+                            },
+                            update = {
+                                it.player = player
+                            },
+                            modifier = Modifier
+                                .fillMaxSize()
+                                .background(MaterialTheme.colorScheme.background),
+                        )
+                    }
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/chat/revolt/components/chat/Message.kt b/app/src/main/java/chat/revolt/components/chat/Message.kt
index b571769b..7f0854d7 100644
--- a/app/src/main/java/chat/revolt/components/chat/Message.kt
+++ b/app/src/main/java/chat/revolt/components/chat/Message.kt
@@ -30,6 +30,7 @@ import androidx.compose.ui.viewinterop.AndroidView
 import androidx.core.content.res.ResourcesCompat
 import chat.revolt.R
 import chat.revolt.activities.media.ImageViewActivity
+import chat.revolt.activities.media.VideoViewActivity
 import chat.revolt.api.REVOLT_FILES
 import chat.revolt.api.RevoltAPI
 import chat.revolt.api.asJanuaryProxyUrl
@@ -220,14 +221,26 @@ fun Message(
                     message.attachments.forEach { attachment ->
                         Spacer(modifier = Modifier.height(2.dp))
                         MessageAttachment(attachment) {
-                            if (attachment.metadata?.type == "Image") {
-                                attachmentView.launch(
-                                    Intent(context, ImageViewActivity::class.java).apply {
-                                        putExtra("autumnResource", attachment)
-                                    }
-                                )
-                            } else {
-                                viewAttachmentInBrowser(context, attachment)
+                            when (attachment.metadata?.type) {
+                                "Image" -> {
+                                    attachmentView.launch(
+                                        Intent(context, ImageViewActivity::class.java).apply {
+                                            putExtra("autumnResource", attachment)
+                                        }
+                                    )
+                                }
+
+                                "Video" -> {
+                                    attachmentView.launch(
+                                        Intent(context, VideoViewActivity::class.java).apply {
+                                            putExtra("autumnResource", attachment)
+                                        }
+                                    )
+                                }
+
+                                else -> {
+                                    viewAttachmentInBrowser(context, attachment)
+                                }
                             }
                         }
                         Spacer(modifier = Modifier.height(2.dp))
diff --git a/app/src/main/java/chat/revolt/components/chat/MessageAttachment.kt b/app/src/main/java/chat/revolt/components/chat/MessageAttachment.kt
index 20ee3ec8..53e6a703 100644
--- a/app/src/main/java/chat/revolt/components/chat/MessageAttachment.kt
+++ b/app/src/main/java/chat/revolt/components/chat/MessageAttachment.kt
@@ -3,11 +3,20 @@ package chat.revolt.components.chat
 import android.text.format.Formatter
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
-import androidx.compose.foundation.layout.*
-import androidx.compose.material.Icon
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.aspectRatio
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.width
 import androidx.compose.material.LocalContentColor
-import androidx.compose.material.Text
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.PlayArrow
+import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
 import androidx.compose.material3.surfaceColorAtElevation
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.CompositionLocalProvider
@@ -17,6 +26,7 @@ import androidx.compose.ui.draw.clip
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import chat.revolt.R
@@ -76,8 +86,39 @@ fun ImageAttachment(attachment: AutumnResource) {
 
 @Composable
 fun VideoAttachment(attachment: AutumnResource) {
-    // FIXME Use ExoPlayer to play videos.
-    FileAttachment(attachment)
+    val url = "$REVOLT_FILES/attachments/${attachment.id}/${attachment.filename}"
+
+    Box(
+        contentAlignment = Alignment.Center,
+        modifier = Modifier
+            .fillMaxWidth()
+    ) {
+        // Turns out that when you give Glide a video URL, you get a perfectly cromulent thumbnail.
+        RemoteImage(
+            url = url,
+            contentScale = ContentScale.Fit,
+            modifier = Modifier
+                .fillMaxWidth()
+                .aspectRatio(attachment.metadata!!.width!!.toFloat() / attachment.metadata.height!!.toFloat()),
+            description = attachment.filename ?: "Video",
+        )
+
+        Box(
+            modifier = Modifier
+                .width(48.dp)
+                .aspectRatio(1f)
+                .clip(MaterialTheme.shapes.medium)
+                .background(MaterialTheme.colorScheme.surfaceColorAtElevation(2.dp)),
+        )
+
+        Icon(
+            imageVector = Icons.Default.PlayArrow,
+            contentDescription = stringResource(id = R.string.video_viewer_play),
+            modifier = Modifier
+                .width(32.dp)
+                .aspectRatio(1f),
+        )
+    }
 }
 
 @Composable
diff --git a/app/src/main/java/chat/revolt/provider/AttachmentProvider.kt b/app/src/main/java/chat/revolt/provider/AttachmentProvider.kt
index 0d50f596..8477b9c8 100644
--- a/app/src/main/java/chat/revolt/provider/AttachmentProvider.kt
+++ b/app/src/main/java/chat/revolt/provider/AttachmentProvider.kt
@@ -1,7 +1,35 @@
 package chat.revolt.provider
 
+import android.content.Context
+import android.net.Uri
 import androidx.core.content.FileProvider
 import chat.revolt.R
+import chat.revolt.api.RevoltHttp
+import io.ktor.client.request.get
+import io.ktor.client.statement.readBytes
+import java.io.File
 
 class AttachmentProvider : FileProvider(R.xml.file_paths) {
+}
+
+suspend fun getAttachmentContentUri(
+    context: Context,
+    resourceUrl: String,
+    id: String,
+    filename: String
+): Uri {
+    val attachmentsDir = File(context.cacheDir, "attachments")
+    if (!attachmentsDir.exists()) {
+        attachmentsDir.mkdir()
+    }
+
+    val response = RevoltHttp.get(resourceUrl)
+    val file = File(attachmentsDir, "$id-$filename")
+    file.writeBytes(response.readBytes())
+
+    return FileProvider.getUriForFile(
+        context,
+        "chat.revolt.fileprovider",
+        file
+    )
 }
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index a3f396d2..af4bbfca 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -236,6 +236,16 @@
     <string name="image_viewer_share_url">Share URL</string>
     <string name="image_viewer_share_image">Share image</string>
 
+    <string name="video_viewer_title">%1$s</string>
+    <string name="video_viewer_play">Play</string>
+    <string name="video_viewer_pause">Pause</string>
+    <string name="video_viewer_save">Save</string>
+    <string name="video_viewer_saved">Saved</string>
+    <string name="video_viewer_save_failed">Failed to save video</string>
+    <string name="video_viewer_open">Open</string>
+    <string name="video_viewer_share_url">Share URL</string>
+    <string name="video_viewer_share_video">Share video</string>
+
     <string name="settings_appearance">Appearance</string>
     <string name="settings_appearance_theme">Theme</string>
     <string name="settings_appearance_theme_none">System</string>
diff --git a/build.gradle b/build.gradle
index a0bf34cc..d65ddf02 100644
--- a/build.gradle
+++ b/build.gradle
@@ -10,6 +10,7 @@ buildscript {
         glide_version = '4.14.2'
         ktor_version = '2.1.3'
         aboutlibraries_version = '10.5.2'
+        media3_version = '1.0.1'
     }
 }