When creating a Stream Ad, the "Ad Avatar Image" automatically resizes to the proper size necessary, but the "Ad Content Image" must be manually resized before uploading is possible.
It's not necessarily a bug, but it would be awesome if the "Ad Content Image" would automatically resize just as the "Ad Avatar Image" does.
I saw you have more AdAgency tickets, please submit one ticket to the support team, they will be able to help you.
www.jomsocial.com/submit-support
with your website details.