Why I can not update Cover Artwork?
Please check your Artwork File:
Cover size: from 1400x1400 (don't accept 1000x995, 600x800 etc...)
Color mode: RGB (don't accept CYMK)
Format: JPG (We dont accept any other formats, If you have PNG or TIF file format, please don't change name from .png to .jpg, you need to use special converter)
Best Quality - Please understand that iTunes don't accept low quality artwork, if you have any problems please contact to our design guys: email@example.com