Your artwork needs to be at least 1400 X 1400 and can be as big as 3000 X 3000 as long as the file size is less than 500 kb. In this tutorial we have a square image but its too small. I use a free online tool to make it bigger while staying in spec.
Podast Artwork Resize - Fixing Podcast Artwork
Daily Podcast Tips - Grow Your Show!
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