I am trying to change the icon of my info widget. I donwloaded the original icon as png, changed it as desired and tried to update it in my widget. When I use the png format I can upload it but when I try to save it, I always get the message "unable to complete operations". Uploading a gif worked well but I think a png would look a bit smoother and would match better the original icons. Any idea what causes this issue? The hint for changing the icon says, png, gif and jpg are allowed file formats.
Thanks in advance!