Cannot add item to custom collection

[fritzmg]

I have now executed what I think are the equivalent actions in Synology's Container Manager, i.e. Stop, Clean, Build, Start.

But still the only option that is available in the <select> when I choose "Add to collection" is "New…".

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The GET request for the "Add to collection" popup, i.e. https://jellyfin.example.com/Users/…/Ite...ount=false returns the following JSON:

Code:

{"Items":[],"TotalRecordCount":0,"StartIndex":0}

However, in /config/data/collections I can see that there are several [boxset] collections (one of which is the manually created one).