diff --git a/gateway/platforms/base.py b/gateway/platforms/base.py
index 708a8b62367e..2568d4749774 100644
--- a/gateway/platforms/base.py
+++ b/gateway/platforms/base.py
@@ -1478,7 +1478,7 @@ MEDIA_DELIVERY_EXTS: Tuple[str, ...] = (
     # Images (embed inline)
     ".png", ".jpg", ".jpeg", ".gif", ".webp", ".bmp", ".tiff", ".svg",
     # Video (embed inline where supported)
-    ".mp4", ".mov", ".avi", ".mkv", ".webm",
+    ".mp4", ".mov", ".avi", ".mkv", ".webm", ".3gp",
     # Audio (delivered as voice/audio where supported)
     ".mp3", ".wav", ".ogg", ".opus", ".m4a", ".flac",
     # Documents (uploaded as file attachments)
diff --git a/plugins/platforms/feishu/adapter.py b/plugins/platforms/feishu/adapter.py
index e1df2a05e5e5..751c2bf76dfd 100644
--- a/plugins/platforms/feishu/adapter.py
+++ b/plugins/platforms/feishu/adapter.py
@@ -5447,7 +5447,7 @@ def _qr_register_inner(
 # ──────────────────────────────────────────────────────────────────────────
 
 _MIGRATION_IMAGE_EXTS = {".jpg", ".jpeg", ".png", ".webp", ".gif"}
-_MIGRATION_VIDEO_EXTS = {".mp4", ".mov", ".avi", ".mkv", ".3gp"}
+_MIGRATION_VIDEO_EXTS = {".mp4", ".mov", ".avi", ".mkv", ".webm", ".3gp"}
 _MIGRATION_AUDIO_EXTS = {".ogg", ".opus", ".mp3", ".wav", ".m4a", ".flac"}
 _MIGRATION_VOICE_EXTS = {".ogg", ".opus"}
 
diff --git a/tools/send_message_tool.py b/tools/send_message_tool.py
index 9c1d41eaf0fd..809a522f67b3 100644
--- a/tools/send_message_tool.py
+++ b/tools/send_message_tool.py
@@ -62,7 +62,7 @@ _EMAIL_TARGET_RE = re.compile(r"^\s*[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2
 # never read. Map the exceptions so the error guidance is actually actionable.
 _HOME_CHANNEL_ENV_OVERRIDES = {"email": "EMAIL_HOME_ADDRESS"}
 _IMAGE_EXTS = {".jpg", ".jpeg", ".png", ".webp", ".gif"}
-_VIDEO_EXTS = {".mp4", ".mov", ".avi", ".mkv", ".3gp"}
+_VIDEO_EXTS = {".mp4", ".mov", ".avi", ".mkv", ".webm", ".3gp"}
 _AUDIO_EXTS = {".ogg", ".opus", ".mp3", ".wav", ".m4a", ".flac"}
 _VOICE_EXTS = {".ogg", ".opus"}
 # Telegram's Bot API sendAudio only accepts MP3 / M4A. Other audio