Nextcloud file locked, won't delete. Help!

Описание

Recently I picked up nextcloud to host my own files and what I used to set it up was cpanel through my domain hosting. I recommend it if you've ever used dropbox or box, but what to DIY.

(I basically followed this guy's methods https://youtu.be/vDFBVrFrTOY)

Now after I went and set everything up, it worked. There's some security fixes and tweaks that have to be made but for the most part uploading files and sharing them function wise worked.

Then I came to an issue (as you see here) with certain files being locked where they don't delete themselves. I personally have no idea why at this point (newbie), but among other things that need attention with my setup I wish to correct this locking of files.