Rescan External storage - pending status

I have NC 16.0.4 running on Ubuntu server 18.04.
Server has 500 GB of internal hard drive where Ubuntu and Nextcloud are running.
I have connected external 2 TB HDD via USB.
There are several folders with data but I do not see any volume size of this folders (on external drive).
I see only status “Pending”.
I would like to know how to fix it.
Volume size is working fine for folders on internal HDD (default location).

My installation process:

  1. Ubuntu server + SSH
  2. MariaDB
  3. Nextcloud

It is NOT snap installation of Nextcloud.

Thank you for your reply.