How do I get edge (SD) recording of cameras (Ring Edge for Alarm Pro)?

How do I get edge (SD) recording of cameras (Ring Edge for Alarm Pro)? The plans page (https://ring.com/plans) is ambiguous and unclear about how this is achieved. It shows that it's "included" with the Premium plan, but when you hover over the description, you get this: "Store your videos, and more, locally on a microSD card, sold separately, in your Alarm Pro to keep them private and secure." If it's "included" then why is something ELSE "sold separately"? And what does "in your Alarm Pro" supposed to mean? If this feature is "included" with the "Premium" plan, then why is it not actually included? What exactly is the "sold separately" part of this feature, WHERE is the info on it, and HOW MUCH does it cost? Are we just talking about an SD card or something else? And where exactly does this SD card live? I see no slots or ports anywhere on any of the devices in my Ring "Pro" Alarm kit to add an SD card. Didn't notice any on the Ring Doorbell or Floodlight Pro camera either. And what is "Alarm Pro"? Is that some other service I have to pay for to get this functionality, or is it referring to the alarm system itself? And again, WHERE does the SD card go? Ring is doing a horrible job of presenting this info in a SIMPLE and straight forward manner in order to make a purchase decision...or not. This is starting to feel like a lot of bait-and-switch....