To test it I recording two tracks using Audiobus. One was from iFretless bass and the other was from sampletank. I also recorded a midi file from within Cubais. I’m not sure it matters where the files are from because it was duplicating audio files that I imported using the wifi server.
I tried different things to get the files to duplicate. What worked was when I mininmized Cubasis using the home button. I then double clicked the home button to bring up the running apps and then pressed Cubasis until the minus sign appeared to close the app. I closed the app and then re-opened Cubasis and the audio files from the project that I was last working on were duplicated in the trash folder. The midi file was not duplicated.