Apple Podcast has recently updated some of the requirements for their podcasts and their submissions, specifically on things like the artwork.
Before, they just had standard pixel size, dimensions, resolution, file type, and color space for the artwork. But, it looks like they added that images can’t be blurry, misaligned, smashed, they can’t have any explicit content on the covers themselves, and they’ve even added some notes on trying to use an asterisk to cancel out some of the letters.
So, there’s a whole bunch of newer specifications that could mess up what you have or affect what you’re planning to use. Check out the link below to review the requirements.
Original Medium: Apple Podcast Requirements (Website)