Hi,
Reguarding copy/paste from ubuntu 20.04.3 on the NUC via NoMachine to your Mac.  My experience is with a Unbuntu 20.04.3 on an Odroid to the Mac via NoMachine.  I find I have to include the finder as intermediate step when copying from the NoMachine window to an OS App. e.g. copy in NoMachine on the remote machine, click on the Finder in the task bar, then click in the task bar to my target OS X app. It seems (this might be superstition) that the Finder does the acquistion of the copy buffer from NoMachine more reliably than directly to another app.

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