External drive Nextcloudpi on RsB5

Hi, I have the Nextcloudpi on a R5 up and running - support for external devices is enabled. External device is a Sandisk 512GB USB stick. The stick will not be found.
Question 1: How can I make the drive visible?
Question 2. How do I dedicate the USB drive to all data?

Can check this how to on mounting a drive using UUID
Also best to format the drive using ext4 or btrfs, as ncp does not support fat or ntfs

Thank you.