Thanks for sharing, I went through the post, and in particular, this line caught my attention.

Users pay Lightning invoices from a Liquid bitcoin (LBTC) balance and receive Lightning payments that add to their LBTC balance automatically.

I read it as saying the Liquid balance takes care of both Lightning and Liquid transactions (incoming or outgoing).

But in the app, at least the current one I have that is not really the case. My lightning balance is 540 Sats, and I cannot add anything. My liquid balance is about 20,000 Sats, but when I try to Send from it, I am asked for a Liquid address, a lightning address (username@coinos.io, as an example) is rejected as invalid.

So not sure if I am reading it wrong, or they are misleading or this is a feature yet to arrive. Meanwhile, I cannot use the app for any lightning (send or receive).