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Synology DS920+ & DX517 Expansion Unit

I recently purchased a DX517 to add an additional 5 bays of storage to my already substantial 4x20TB 920+. While the actual physical setup was fine, the newer versions of DSM contain a bug and the UX leaves a little to be desired.

Learnings

The instructions indicate that you should look at Hardware/External Devices and see the DX517. However, it won't appear. However, checking Control Panel / Info Center /Hardware.Expansion Unit 1 will show the DX517.
Once you put a drive (or more!) in the DX517, the unit & drives will show up in Storage Manager / Overview.
Drives in the DX517 cannot be added to an existing SHR pool on the 920+ or at least it wouldn't let me. This might be due to my expansion drives being smaller or it might be intentional due to the fact it would all be running over a single cable in the back.

Drives in the DX517 are in their own pool(s).

Answers to Questions I've Seen Elsewhere

HDDs not on the official approved list will still work in the drive. That said, this is a NAS and you should prioritize durability.
The 920+ contains a memory expansion slot to upgrade it's existing 4GB. The specs say that you can add another 4GB when in-fact, you can add a 16GB chip. Control Panel / Info Center / Hardware.Total Physical Memory for details.

DX517 Documents

DS920+ Documents