Audio data does not change when re-importing a wave file

When re-importing a wave file, the audio data does not change.

1. Create a new project
2. Import a wav file to project
3. Move wav file to scene 
4. PIE 
5. Edit wav file externally
6. Re-import wav file in project

Result: Audio data in wav file does not change.

Expected: Audio data should reflect the edits made in external program