BM3 & Files.app issue...
This could be a 'Files.app' issue or a 'BM3 Issue'.
When browsing the BM3 Folder using Files.app/DocumentPicker and accidentally tapping on one of the *.wav files BM3 is launched and the selected files is copied to the BM3 /Samples directory. (To my knowledge It _is_ be possible for the receiving app to check what app the selected file comes from and if it comes from 'it self' the operation should be canceled).
This becomes a major PITA when using the Files.app 'pop up' for drag'n'drop operations to other apps.
If the files is tapped by accident within the pop-up BM3 is opened and the files is copied to BM3's /Samples folder.