Try Tools > Options > File Location > Cover Art > Also store image in the file's tag
@JRFan: The search box at bottom of the Options window can be very helpful in finding options like this one, especially if they have been moved or modified over time.
FYI: I (and many others) keep the cover and additional artwork images, docs, etc. in the album folders. They are easily found there and don't consume much space compared to music files (typically <1% of the folder size for modest sized images).
RMB track > View Extras displays them. The images can also be tagged and then targeted in an MC Image View by using an appropriate image file folder rule, for example
[Artist]\[Album]\ .
You may also consider the program Mp3tag which allows one or more images to be inserted into flacs as "tags" in the file header. They can be added manually, appended one image at a time, simultaneously to selected files. Best to start with cover in first position with the default Mp3tag Cover Type "Front Cover" so that MC treats it as such. To change order, use Mp3tag to remove them and start over as needed. The process can be automated for a range of selected tracks using an Mp3tag Action, assuming the image files are suitably named and located, wild cards allowed (I've never tried it). You can send files directly to Mp3tag from an MC SmartList, Playlist, album, or other track selection (
RMB > Send To > Send To (external) > Mp3tag). However, I don't know of a way for MC to display more than one image read directly from a flac header. Multiple embedded images seems to be a flac feature (METADATA_BLOCK_PICTURE) which is not fully supported by MC.
Win 11 Pro (64-it) | MC 32.0.33 (in beta)