I wasn't able to when I tried it yesterday. Sync was my favorite Reddit client, but it's Lemmy offering leaves a lot to be desired so far. It's early in development though so I can't judge it too harshly, posting on here is slightly more complicated than posting on Reddit.
It's getting there though, using it now for the comment. But, I would'nt recommend it yet as it keeps crashing on some parts. Will keep lift off on my phone for now.