Could be I made a mistake, I was shure it was a DSD file! The hard disk is attached to Nucleus now, so looking through network settings I found new file. Maybe this is a better example … I do not want the conversion to PCM!
Make sure that you have DoP enabled in Roon or SoTM config. The Lampi DAC has Amanero so if you do not have the correct firmware (>2004, I believe) you will not get native DSD support. Sending the stream via DoP is still native DSD and it will not be converted to PCM and back.
Edit: Sorry, I do not have any experience with SoTM so my above comment is just a guess.