Guild logo upload button is missing. I tried Safari, Chrome, edge and firefox.

viewtopic.php?f=3&t=4112

Disable ad block if you have it and enable flash on PC.

If on the phone switch to PC

I think this is the 4th time someone asked for help on this, a few was made in the bugs forum, IIRC Cj said they will change this so the problem don't happen again.