Not really, but i'm interested. Because of this, I unfortunately don't keep my audio recordings (small) library in Joplin
I did for a little while have an app on my phone that i did all my voice notes on, and saved the files locally, then another app that synced the voice notes from my local phone folder to my oneDrive, and then had that folder set up using the Hotfolder Plugin to import the audio files themselves into Joplin
With so many moving parts though, i set them up and ran out of capacity to constantly check that each place was getting synced correctly