I was able to use avatars today, I tried using avatars from my gallery and apparently nothing worked. All the images I have are too large. It turns out that there are special requirements for avatars "120px wide, 80px high, and 100 KiB size". Can this be done automatically? So that images can be automatically resized after uploading?
Theymos needs to add these features, and I don't think he wants to do that. He doesn't want to make any unnecessary changes at the backend. This feature is mostly used in signature promotion, and a resized avatar is always provided by the campaign manager. There aren't that many users who use these features outside of signature promotion.
There are many free online tools that can do this work, so use them. Free image resizing tools:https://imageresize.org/.