User blog comment:PannedStar/MSSB Goku/@comment-28485262-20190304184041/@comment-2113997-20190304192619

What you can do is name your thumb something like STRCSSGokuThumb.png and artwork same but artwork.

You can use any name you want (except some "special" ones like curse words etc.) but just make sure the image doens't exist already with the same name. Otherwise it would overwrite the existing image.

If you want to check if a file name is already in use you can always type in the search bar (browser) and write https://dbz-dokkanbattle.fandom.com/wiki/File:xxx.png (xxx = is filename)