I recently started using MC18 with my Samsung Galaxy S III to sync music playlists to it's SD card. The music and playlists are recognized by several media players so things are working well. My concern, however, is that as playlists that I have chosen to sync with my phone change that titles no longer in those playlists will remain on the phone. The solution, it would seem, is to use the "Delete from handheld any files not in sync list" option. The concern I have is that when I select my phone's SD card under MC18's "Drives & Devices" there are many titles (music, photos, podcasts, and videos) detailed as "On Device" that were not put there by MC18 and I do not want them deleted by MC18's sync process.
I've searched through many threads and the online manual but have been unable to learn how MC18 handles this. Does it have its own file paths that keep its content separate from other app's content? My assumption is that if I select the option to "Delete from handheld any files not in sync list" I will wipe out everything I see in the "On Device" list.