Yes there is! Just click on the "advanced" tab when you're uploading and you can see the steemit article blog :D hope that helped!
With commenting - I'm not too sure. I can comment fine on my mac and also pc computers and also on my iPhone. Are you using android?
upvoted
I'm doing it from my MacBook Air... I must be doing something wrong!
Hmm...I've actually done it on my macbook air and it's uploaded fine for me. I'm using the latest version, maybe that has something to do with it?