Why I can not update Cover Artwork?

Please check your Artwork File:

Cover size: Minimum Size: 1400x1400 pixels /  Recommended Size: 3000x3000 pixels

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)