we used to run on S3, where we mounted the recordings with s3fs-fuse[1]
which we ran successfully on 1.6.20.

HOWEVER, when we updated to 1.8.5 we ran into problems with the wave
files, the media stream was not saved and we ended up with empty media
containers, with only some meta data of around 250 bytes ended up being
saved. This issue affected about half of all recordings, and we found no
correlation in regards to codecs used etc. If this was an issue with
configuration, s3fs-fuse or Freeswitch we didn't investigate.

We solved this by moving the storage from S3 to EFS, and are currently
running it in production without issues in that regard.