The 'added to collection' date can be used to (for example) filter the collection but there's no way (AFAICT) to display the value for any particular track. I think it ought to be on the Summary tab of the Edit track details. I'm not sure whether it used to be there or whether I'm remembering it from strawberry.
A possibly relevant merge request was started @ https://invent.kde.org/multimedia/amarok/-/merge_requests/146
Git commit ee12bc1a094a474a8a57043c3cacd62f0b32b444 by Tuomas Nurmi. Committed on 13/09/2025 at 17:12. Pushed by nurmi into branch 'master'. Show added to collection time in tag dialog when available There's plenty of space, so show the information when the track's in a collection that provides sensible added times (seems to be that only sql collection does, which makes sense). M +1 -0 ChangeLog M +18 -0 src/dialogs/TagDialog.cpp M +32 -0 src/dialogs/TagDialogBase.ui https://invent.kde.org/multimedia/amarok/-/commit/ee12bc1a094a474a8a57043c3cacd62f0b32b444