This is for Discord. To be specific to my case, very occasionally, when pasting .jpeg/.jpg images from the clipboard after copying images from websites (typically twitter or tumblr), the file uploads as a .jfif, requiring that users download to view, and do not have a preview. I have a feeling this is not a problem originating from ripcord, but I don't have enough knowledge about the processes involved. Thank you very much.

Is this on windows 10? Please double check this registry:

HKEY_CLASSES_ROOT\MIME\Database\Content Type\image/
Name: Extension

https://www.reddit.com/r/Windows10/comments/af0azy/windows_10_had_been_saving_nearly_every_image_as/