Board Thread:Support Requests - Designing Your Wiki/@comment-26525672-20191017152641/@comment-9605025-20191017164451

Yes, but it really is easier to just use ThemeDesigner. Can you upload it to your wiki like a regular image and provide a link? Usually when this happens, it is because either something it wrong with the file or the user misread the file size and it isn't under 300 kB.