If you have audio files (.MP3 or .WAV) on a network drive, accessible via a Universal Naming Convention (UNC) path, you may find that the audio import dialog hangs.
To import your audio files, do either of the following:
Move the audio files to a local drive, then import.
Map your network drive to a local drive letter.
Once your audio files are accessible via a path that includes a drive letter, the import should work as expected.
Example UNC path:
Example drive letter path: