Images not pulled from m4a files

[GeneBean]

Can anyone tell me why when I upload m4a music files that I can see via Finder on my Mac have images embedded, the images don't show up in Jellyfin? The files are the DRM-free ones downloaded with Apple Music after purchase.

Version: 10.8.13
Operating System: Linux (NixOS)
Architecture: X64
Installed via NixOS (details in https://github.com/genebean/dots/blob/ma...efault.nix)