I can't change the folder icon.
I know HOW to change it and I have done it before, but I am now having trouble getting it to show properly.
In the "Get Info" popup, when I try to paste the new png or jpeg image onto the old folder icon it only shows the DEFAULT file type icon for png and jpeg. The actual image does not appear. I've tried to repeat the process on folders that I have previously changed successfully only to have them now show the default icon.
Mac OS High Sierra
10.13.2
iMac, macOS High Sierra (10.13.2)