Collections don't have thumbnails

[troothdotcom]

was a solution for this ever figured out?

[jd90]

Yes, like others my collections were automatically created in a "locked" state ("Lock this item to prevent future changes"), *AND* "Save artwork into media folders" was enabled by default (in spite of my media directories being obviously read-only to Jellyfin - as they well should be), which was a deadly combination.

[gizmomelb]

was a solution for this ever figured out?

Yes.  Actually bothering to read through the thread will find you the solution, but to make it easier - read it here - https://forum.jellyfin.org/t-collections...6#pid33196