format .mp4 not working lets try recode it to older container format 
well i gave up heres the url facebook acct required lhttps://www.facebook.com/reel/27311877425114707 
Burner : you upload to youtube and then "upload" from youtube ... little difficult , long time not have done so
Burner : To post videos in a phpBB forum, use built-in BBCode for streaming sites, install the official phpBB Media Embed PlugIn extension, create a custom MP4 BBCode, or adjust attachment settings in your Administration Control Panel (ACP).
Burner : An Admin have to do something
Burner : a link to a video is no problem , but to show the video .... we cant as far as I can see
We need Curse for this.
https://www.youtube.com/shorts/E2IBZjYU3pg