Nextcloud permissions

[Itsmittyhere]

I am running Freenas 11.2, I have installed the Nextcloud plugin and working locally. I also have Plex server installed and working. I created and external storage in Nextcloud and pointed that external storage to my Plex folder with all my photo's. I can see the Plex folder all the files in Nextcloud, however I cannot add anything to that folder. At the top of the Nextcloud page it says "You don't have permission to upload or create files here". I am very new to Freenas an Nextcloud. I have read that you have to set the permissions to www-data. I'm not sure where to do that at, or if its even my problem.
Thanks in advance!

Fixed! Changed permissions in the dataset from wheel to www and checked the box that says Apply permissions recursively.