External Storage issude -Nextcloud 11.0.2 on Raspbian Raspberry3 B

I have successfully installed Nextcloud 11 on Raspbian. I have brought it online and forwarded ports. Everything is working fine, except for the fact that I camount an external drive, but I cannot access it afterwards (Yes, the indicator does turn green when mounting it on Nextcloud). I don’t know if it is because I need to give it permission to it or if it is an issue with Nextcloud.

Either way what would be the steps to solve this problem? What would be the commands to give permission to it if indeed that is what I need?

Thanks in advance guys!