Homebase 2 - Expandable storage

The only reason I chose the EUFY doorbell was because it came with homebase 2 with internal storage.
It had a USB port in the back so I thought in the future they would allow external storage.
I was disappointed when they still have been enabled us to use the port.
Now I hear we have to buy homebase 3 in order to use external support.
When will this be available?