to respond the old way, tap the pencil and paper in the bottom right corner, to respond like this, tap the speech bubble in the middle.👌

I wish I could do that but for some reason I have yet another update and it doesn't have the pencil. I've figured out a way but it's rather inconvenient. oh well :P

Weird! Maybe PC is still in the process of updating?

Yeah, so to respond to stuff with a remix I have to tap the collage, tap the "remixes" and press the weird big button that says "remix collage". The little pencil is gone. Just as I was getting fond of it. ✏️😂