Yes I can mark phots as rejected but the problem is I can't turn them off in the grid view and they don't get greyed out, I can't easily see if its rejected or a keeper. So that's makes the mobile editing process a little annoying.
And no I can't delete them yet, because I have them synced with LR Classic. And if I delete them before the "rejected" status had a chance to transfer onto my desktop PC I would still have them in LR Classic and would again have to decided which ones to keep or not.
So please make the rejected status visible by marking these photos somehow, just show them greyed out like on desktop.