[McAroni]

Specifically, I tried to inserting another song from the same csv import. Of course this doesn't work but the attempt alone completely overwrites the original file (that was the reason for the 471 byte pdf) and I had to delete all songs belonging to the csv import from the library before I could re-import them. I will make a video later.
So, in my opinion a warning is absolutely necessary, the possibility of a "save as" option would be great.