Plex can't see the folder, what's the problem?

Question

linux

Through the console, the folder is visible and everything is normal.

[email protected]:~$ cd /media/roman/hdd/Plex/Serials/'Stranger Things'
[email protected]:/media/roman/hdd/Plex/Serials/Stranger Things$ ls
Stranger.Things.S02E01.Chapter.One.Madmax.mkv
Stranger.Things.S02E02.Chapter.Two.Trick.Or.Treat.Freak.mkv
Stranger.Things.S02E03.Chapter.Three.The.Pollywog.mkv
Stranger.Things.S02E04.Chapter.Four.Will.The.Wise.mkv
Stranger.Things.S02E05.Chapter.Five.Dig.Dug.mkv
Stranger.Things.S02E06.Chapter.Six.The.Spy.mkv
Stranger.Things.S02E07.Chapter.Seven.The.Lost.Sister.mkv
Stranger.Things.S02E08.Chapter.Eight.The.Mind.Flayer.mkv
Stranger.Things.S02E09.Chapter.Nine.The.Gate.mkv

And Plex does not see

the System folder on the SSD, but the Plex folder on the HDD

Answer 1

chown -R www-data:www-data /folder
Well, or how does it work there

Answer 2

Put ms, sudo apt-get install mc, and from there give permissions to the folder