the question is simple:
LR6.x tells me that it cant move the file I want to delete to a trash, because it does not recognize my trash on my synology nas. Thats ok. I know that the nas owns trash is used.
But whats annoyingly is that LR shows this warning whenever I delete a photo. Can I deactivate or solve this somehow?
Could you show us a screen shot of the warning dialog that you are getting. I don't think it is LR that is displaying that warning. I think it is your OS as the NAS you are using is more than likely using some type/version of Linux as the OS.