For macOS 10.10 and later only. This script will export then re-import the artwork data of the selected tracks obliging iTunes to embed the artwork in the track's file's meta-data.
For best results, use with an album's worth of tracks--or so--at a time. iTunes may be obliged to perform a number of background tasks when applying image data and may prevent the script from proceeding if a large amount of data is involved.
Note: this app does not affect how the Finder may or may not display a file's icon image.
Also see Tracks Without Embedded Artwork.
Perhaps Also of Interest...
downloaded 35m 52s ago
Remove iTunes tracks disassociated from files
downloaded 43m 3s ago
Display, create text file listing info of dead tracks
downloaded 44m 56s ago
Drag and drop files and enter multi-edit tag info before files are added to iTunes
downloaded 45m 7s ago
Display a selected file's audio and Spotlight metadata
downloaded 1h 40m 54s ago
Check scripts downloaded to your computer from dougscripts.com for latest version
downloaded 2h 2m 27s ago
Title Cap various track tags, featuring editable exceptions lists