Test audio recording on mobile devices (iOs and Android)

[laineyhm]

We need to confirm that changes from #1474 are working on iOS and Android mobile devices.

Testing instructions
[ ] 1. Open the HTML docker container in lf-app. Open assets/lexicon/sf_my_dictionary/audio. This is where all saved recordings and uploaded audio files go.
2. Record a short (<6 second) clip online, play it back, and save it. See if it is found in the container twice: once in the .webm format and once as a .wav file.
3. Record a longer (>6 second) clip online, play it back, and save it. See if it is found in the container twice: once in the .webm format and once as an .mp3 file.
4. Upload a long and a short clip of each of these file types: .ogg, .flac, .m4a. See if they are found in the container twice, with conversion to .wav for the short files and .mp3 for the long files.
5. Upload an .mp3 and a .wav file to see if these files are stored in the container "as-is"; no conversion, no second copy.
Here is a folder of test files to use: Audio Test Upload Files.zip

[ ] See if files added online come into FLEx via Send/Receive.