Board Thread:Support Requests - Designing Your Wiki/@comment-27023843-20170404125123/@comment-26084508-20170404131904

You can upload any size of image within 300 KB.

If the image is too small then check the tile box. But the best size for wiki background if you want fix background is 1900px x 1000px.

Image type .png or .jpg

BTW the Massage you replayed is an automated welcome massage sent by a BOT.