Description

Sending audio files ie via Realtime is failing with the GUI because the whole base64 is being read by Path(piece.original_value).is_file(), which treats the whole string as a potential filename, which obviously is too long and thus errors out.
As a fix, this adds two guards:

1. Length check (< 4096) — no real filesystem path is that long, so skip the check for base64 data
2. try/except OSError — catch any remaining edge cases where the OS rejects the path

This lets the base64 audio data flow through to the serializer where it gets properly decoded and saved as a .wav file.

Tests and Documentation

Tested manually via UI and reran all tests and added new unit test