Open File Station, right click on your Documentaries folder and select Properties.
Go to the Permission tab, then highlight PlexMediaServer in the list of Users or Groups, then click on Edit.
Make sure the permissions are set correctly with all Read/Write options selected and click on Done.
Then make sure you enable Apply to this folder, sub-folders and files at the bottom of the dialogue and click on Save.
If you do not see PlexMediaServer listed under Users or Groups, then open Control Panel > Shared Folders.
Select your Documentaries folder and then click on Edit. Go to the Permissions tab and in the drop down menu (top left) select System Internal User.
Then make sure PlexMediaServer has Read/Write permissions. Do not be alarmed if it shows Custom as being selected, that is OK.
Make sure you click on Save.
After you have checked the permissions etc. then go to your Documentaries library in Plex and Scan Library Files for that library.
With a little luck, Plex will now find your files.
