Adding external storage

From a previous post, you may know I lost everything: all configs, all users, the lot.

I’m now going to have to spend days trying to remeber what I did two years ago to get Nextcloud to run.

The first step is to get my 3 network drives back, but can’t remember how.

Say I have a drive at, with the folder /volume_1/tv, with no passwords.
My computer sees it as smb://server3/volume_1/tv/
What on earth do I put in the “External Drive” page?
I have to fill in:
External Storage
Remote Subfolder
I’ve been trying various combinations, always getting the red dot.
Any help would be appreciated.

|NextCloudPi version|v1.20.7|
|NextCloudPi image|NextCloudPi_12-20-19|
|distribution|Raspbian GNU/Linux 10 \n \l|
|USB devices|sda|
|data in SD|yes|
|data filesystem|ext2/ext3|
|data disk usage|2.3G/29G|
|rootfs usage|2.3G/29G|
|Nextcloud check|ok|
|Nextcloud version||
|HTTPD service|up|
|PHP service|up|
|MariaDB service|up|
|Redis service|up|
|Postfix service|up|
|internet check|ok|
|port check 80|open|
|port check 443|open|