[PROBLEM] RPi 5 + RPi M.2 HAT+ + IQAudio DigiAMP

[D3D5S]

Hello!

I bought a Raspberry Pi M2 HAT+ and did not use the supplied black 16 mm stacking headers, but the 12 mm stacking headers with thread on top, so that the GPIO strip remains accessible, which would have disappeared if the 16 mm stacking headers had been used.
So I connected the Raspberry Pi M.2 HAT+ to the Raspberry PI 5 with the supplied cable, plugged it in, screwed on another four 12 mm stacking headers and attached the IQ AUDIO DIGI AMP+.
Unfortunately, I no longer have any 2.5 mm nuts to secure the AMP module.

But now to the problem:
I have inserted an NVME with M-Key in form factor 2230 with 1 TB. This was recognized by MOODE, I was able to mount it, format it, SMB and NFS activated, access via files in Ubuntu revealed 29.9 GB total, 5.5 GB used, 24.4 GB free.
So I removed the NVME, inserted it into the Inateck USB enclosure, Files shows 1 TB, ext4.
I have copied all my music to the NVME, more than 800 GB.
I inserted it into the M.2 HAT+ and turned MOODE on again, the integration works fine, but the files are not displayed.
In files via SMB or NFS, however, I was able to access, delete and write the files, so 1 TB was actually available.
But now I have formatted the NVME again with MOODE, again 29.9 GB total, 5.5 GB used and 24.4 GB free, again inserted into the Inateck USB enclosure, actually 1 TB again, 1.4 % occupied.
What is the problem?

What do you mean by "files are not displayed" at the step below?

"I inserted it into the M.2 HAT+ and turned MOODE on again, the integration works fine, but the files are not displayed."

Hello Tim!

I meant, that by clicking on NVME at the menu no folders nor files were shown.
When I insert the Inateck USB enclosure with the 1 TB 2280 NVME inside with all my music on it, it's displayed under USB. There is no problem with it.
As already written, I would like to have the music on the NVME, MOODE running from the SD-Card.

Thanks, Steve