Probably VPN interfering with cookies, or an adblocker doing the same. Try turning it off and see if that resolves the issue. If it is a VPN that frequently refreshes IP addresses and there's a cookie mismatch, the system won't see you as logged in.

Honestly my best guess is that it has to do with the specific file. If you were the one who created the image and exported it, you could try re-exporting or seeing if there are other transparency-supported options.

It could be something weird about how OneDrive or your mobile device handles .png files, or perhaps even the way the file was saved. .pngs are touchy sometimes

Hmm, I was able to get the intended behavior using a different .png file. Have you had this problem with other templates or just this one? Could be something specific to the way this file was saved.

Thank you for this. What was the file format of the template upload? Looks like the system isn't correctly detecting the transparency so not adding the background change option.