diff --git a/src/tg_poster.py b/src/tg_poster.py
index b59833b..240e92a 100644
--- a/src/tg_poster.py
+++ b/src/tg_poster.py
@@ -481,7 +481,15 @@ class TelegramPoster:
         normal_limit = self.caption_limit if valid_media else self.message_limit
         fits_normal_limit = len(formatted_text) <= normal_limit
 
-        if valid_media and file_ids and not fits_normal_limit:
+        # Videos embedded as a <video> block in sendRichMessage (Bot API 10.1, a few
+        # months old at time of writing) reliably black-screen on Telegram mobile in
+        # fullscreen - confirmed against the actual failing post: the same file plays
+        # fine via the standard send_video call, so this isn't a problem with our
+        # encoding, it's the mobile client's rich-message video renderer. Route videos
+        # through the standard path unconditionally until that's fixed upstream.
+        has_video = any(m.media_type == "video" for m in valid_media)
+
+        if valid_media and file_ids and not fits_normal_limit and not has_video:
             rich_msg = self.build_rich_message(formatted_text, valid_media, file_ids)
             if rich_msg:
                 try: