Try a file that is smaller than 1MB in size, otherwise you will have to use an external image/video hosting site like https://catbox.moe/ or https://redgifs.com/
Try a file that is smaller than 1MB in size, otherwise you will have to use an external image/video hosting site like https://catbox.moe/ or https://redgifs.com/
Do you have examples?
Maybe something to do with this?
https://lemmynsfw.com/post/165322
https://lemmynsfw.com/post/164553