Board Thread:Support Requests - Getting Technical/@comment-26335203-20181116105523/@comment-37290686-20181118135514

If your picture exceeds FANDOM's size limit, then why don't you open the picture in an editor like Paint, save it as JPG format, and then upload the JPG version? JPG pictures usually have a very small size compared to other formats. Here's even a screenshot:

However, in rare cases for extremely big pictures, if your JPG exceeds 300 KB, then you're going to have to find another one or simplify it. I would only upload PNG files using Special:Upload usually because its file size limit is a great 10 MB (10240 KB).