Drive missing! How do i recover my missing Drive

Hello, I got a problem. One of my Drive showing missing on the Web GUI. Please See the attached image.
I need to recover my missing Drive. Please Help!

I'd attached my missing drive to an another linux os named xubuntu, trying mounted my drive using Gparted, then I found the Error "The primary GPT table is corrupt, but the backup appears OK, so that will be used." After then i follow this thread https://ubuntuforums.org/showthread.php?t=2377227

Now its working fine.

You may see the VIDEO how I solve the problem.

https://imgur.com/1s0vRQU

Thanks for fast reply