Hello, I am new to Freelancer, as you can see my profile has very little filled out.
I have been a Unity3D developer for the past 5 years I have worked on a handful of interesting projects throughout my time developing and I believe I would be a great candidate for this project.
For a reference of what I can do with the audio, please check out BooAlert by glorious gadgets on the Google Play Store. The interface is atrocious, and it needs a huge facelift (currently reconnected with that client and was asked to update everything in it). While it was work from many years ago, it does have working functionality of the audio recording and sharing. It appears you have a sound solution for recording audio, so sharing will be easy enough to add in.
To see the sharing feature you can click on the EVP section of BooAlert. Record a clip, then click "Share*" when it's done. Something to keep in mind is there is a hard limit with sharing files. If you have multiple-minute audio files it will be more difficult to share. I believe email has roughly a 20MB limit, and a minute recording in BooAlert is roughly 5 MB.
I may have misunderstood what you're asking for, though. If you're looking to share the media to another person so they can open the file within the app, then my quote is useless. It would take a good bit more time to complete.
If I understood everything correctly then I'm confident with my two days to complete the project.
Regards,
Ralph