Finding music stored on outboard drives

have 10 TB of music on outboard drives and only 30 albums in the memory of the PC.
Roon only located the 30.
How can I get Roon to recognize the 10 TB on Seagate drives. I can’t seem to get back to the starting point.

How are the drives connected to the PC? Are they attached via USB or is a separate NAS. If it is network storage, then go to Settings / Storage, Add Folders under WATCHED FOLDERS and enter your network storage UNC. For example,
\\[SERVERNAME OR IP]\media\Music\Ambient. Add in username and password if your storage unit or setup require it.

If it is USB (or other directly attached storage like eSATA or Firewire or USB Type C 3.1 Gen 3) and the storage is seen as a local drive, then go to Settings / Storage, Add Folders under WATCHED FOLDERS and select Local Folder and enter the path. For example, D:\MUSIC\HEAVY_METAL.