I downloaded the Hatch theme and have been trying to change the header image. I followed the instructions (go to appearance > header), but every time I try to upload an image, I get the following error message:
'Image could not be processed. Please go back and try again.'
I have tried uploading different image formats (jpg, png) and it doesn't work.
The same thing happens if I try to upload an image from the media library...
Help, I don't know what to do..