Audacity 3.0.2 Linux problem inserting new sound effects

The problem is: I am able to insert the text files into the right folder but I can’t use them.
It seems to me that there’s a missing link…

Could you please provide more info on this @Jens. Perhaps some screenshots and a video showing the issue and I’ll do my best to help.

Hello Mike,
there were comments about this subject coming in.
Result: “Nyquist” could be the reason of this error inside the audacity program while running the procedure itself. - It was recommended (as far as I understood) to remove audacity from the computer and install an older version (1. XXX) - but this option wouldn’t satisfy me as probably I’d lose all the other wonderful and precious options, as delivered by later developments.
Screenshots could be made - but: the comments inside of them would be only in German language…
Thanks for understanding!