This isn’t what you think it is. (It is)

long press the image…

It doesn’t do that for me. It only brings up the menu upon clicking the three dots on the right.

I think buttons would fly in the face of the minimalist aesthetic of the app.

I think my suggestion would only make it more minimalistic.

I don’t think I am explaining it right.

The current image lightbox has four buttons at the bottom - (Upvote), (comments), (share), and (menu)

My suggestion is to replace the (upvote) & (comment) buttons with a wide (download) button. Comments can still be opened with a slide up gesture and there are multiple places to upvote.

(Personal assumption) I think people rarely use the comment button and the upvote button in the lightbox itself.

That was a parody of minority report. You should check it out if you haven’t.

Also if you are into anime, you should check out psychopass which covers a similar theme.