I have a mod collection for Rivals of Aether that I share with my friends often, so I want to add a branding photo so it isnt just an image icon. However whenever I try to add an image it just says "There was a problem uploading the file. Please try again in a little while." Well its been months of sporadic atempts and it never works. I try using different images, different sizes, shapes, png and jpeg, etc. I tried doing it on different browsers, the main app, in incogneto mode. Nothing works!

Any help?