equinux CoverScout 2.3.10 - Manual (Page 15)

Copy iTunes Artwork
As mentioned above, iTunes 7 stores covers externally on your
harddrive. To keep your artwork accessible on alternative
platforms, these covers need to be present within your music
files (as ID3 tags). CoverScout lets you copy all iTunes artwork
into your music files with a single click.
To copy iTunes artwork into your music files:
‣ Click “Copy“ in the toolbar
or
‣ Select “Cover“ > “Copy iTunes Artwork“
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