Character stays in roblox default falling animation in the sever and too other players Please help

If this is the wrong place please tell me but this is going to ruin a game I’ve been working on for about a year I have everything made and coding the final UI’s but now a new bug has arrived, video on youtube because Roblox can’t accept my file type roblox studio bug - YouTube edit sorry about the background noise I forgot to turn of my mic.