mergerfs file listing

We have prepared the storage with mergerfs to be able to add additional drives or external storage anytime later, see #1 (comment 31095).

mergerfs seems to be a good choice with excellent documentation.

However when checking /srv/tubestorage/videos/ we only see 6 videos in the directory, but some hundred have been uploaded, with 122G. Where are they? Permissions seem okay: https://github.com/trapexit/mergerfs#why-cant-i-see-my-files--directories

 mergerfs        1.8T  122G  1.6T   8% /srv/tubestorage

All videos are played by peertube, so they must be somewhere!

Directory config is documented here https://git.fairkom.net/hosting/fairtube/-/wikis/fairtube-storage