I have been having the same issue. I resized my photos and eventually, once they were small enough, they would upload. I don't know if that is the ONLY issue with this error but try re-sizing them to a smaller size. Go down progresively until they will upload to pinterest.
I have been having the same issue. I resized my photos and eventually, once they were small enough, they would upload. I don't know if that is the ONLY issue with this error but try re-sizing them to a smaller size. Go down progresively until they will upload to pinterest.