I am not losing Robux when it errors.
I have tried using multiple internet browsers, both Chrome and Brave.
I have tried removing the previous video.
I have tried reuploading the previous trailer that had already been on the game’s page, which gave this same error.
Not sure, but maybe the Roblox moderation blocks the “fake” contents. Anyways, they can’t see who you are. That happened and was announced on UltraDev’s Twitter too.
Here I am posting on a three year old bug report… lol
It seems I’m having a very similar issue with my game, the error is visually the same and occurs after the same steps are taken but with a different video.
I made a separate post with more information about my particular case: "Error occured" after trying to add video to game thumbnails