DSF and DFF not detected by library

Hi
I have imported some dff files , but they are not detected in the library.
I thought for a while, that they had no tags
But I checked tag existence with kid3, and tags are present.

Is there any log tuning or trick that might help
to see whats going on ?

Mfg
Jacques

Please see: Volumio 3 issues: hints and solutions before posting a new issue.
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l have no problem. But I have my music on a NAS using Twonky server.