From what I understand(and what makes sense) the phone will act just like its got an sdcard in it, the only difference being you can't take the back off your phone and remove it. I would assume you could use Astro normally and transfer things to and from your computer normally using the USB cable. Really the no sdcard thing is not a big deal unless you need more than 32GB of space.
Think of it like there's an sdcard, you just can't remove it.