Only OS drive USB drives showing in library?

I have this setup:
C: SSD (Windows 10)
D: HDD
E: HDD
F: USB
G: SSD
H: USB
Only C, F and H are showing? All the drives which aren't USB are using SATA.
Ideally, I want to be able to add files from my D and E drive.
I'm using Serviio Free Edition.
I can access D and E on my network using my phone or laptop.

C: SSD (Windows 10)
D: HDD
E: HDD
F: USB
G: SSD
H: USB
Only C, F and H are showing? All the drives which aren't USB are using SATA.
Ideally, I want to be able to add files from my D and E drive.
I'm using Serviio Free Edition.
I can access D and E on my network using my phone or laptop.
