The only file manager that I have found so far that will allow me to install plugins in my Galaxy S23 FE Phone with OS- Android 14, is 'EX File Manager', it allowed me to copy and paste any plugin to: Internal Storage/Android/Data/Com.guildsoftware.vendetta/files/plugins.  I tried 5 other file manager apps and all of them had some kind of security/access issue.

I used "Files by marc" (marc apps & software) which supposedly just opens the system's file explorer, but it's kinda odd. Like: have to extract a downloaded plugin in download folder then grab hold of the extracted folder that is to go into plugins and hold it over like: tab s7 > android > data > com.guildsoftware.vendetta > files > plugins while holding what's being moved the entire time and let go of it inside plugins folder but not on top of another plugin lol.  There's no move to then pick something inside android folder and there's no extract directly into anything android folder.

Have previously used EX File Manager.. if that one just works then that might be the way to go

I used to use “FX” file management to use plugins on Android. I had an edge 7, this was a few years ago.
The process of downloading and bringing to the VO/Plugin folder sounds similar.