[Feature] Audio files support

[timkrief]

Is your feature request related to a problem? Please describe.
Can't encrypt audio recordings.

Describe the solution you'd like
You can select between audio an video already, being able to encrypt audio too would be ideal. I think the current video player could likely handle audio files.

Describe alternatives you've considered
One would have to convert all recordings to video files which is not easy to do on phones and would waste storage space.