We've created a lightweight app that creates a custom format of audio + photo + your metadata (tags, notes etc): https://play.google.com/store/apps/details?id=app.pointo

You can share a specific recording by creating a link valid for 24 hours, intended for p2p sharing.

We've heard people use this for similar things: teachers teaching kids, journaling, voice memos, tracking investment decisions, recipes etc. Limitation is that there's one photo per recording atm.