There is no "delete media file" button in the playlist view
After upgrade to latest version of VLC for iOS, there is only "Remove from playlist" button in the playlist view - to actually delete files you need to go back to full file list and find a file to actually delete it.
It's a big problem from point of user experience when you have a lot of uploaded videos, and want to remove something after you watched something.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information