Please take a second look into the UI design. For example the Emoji-selector PopUp obscures most of the Emoji-selector PopUp button that you need to click to hide the Emoji-selector PopUp after selecting an Emoji:
(This pic: screenshot from a laptop screen with 1920x1080px)
And also sometimes the image preview for uploaded images isn't working (no preview at all). I didn't investigate it further but instead decided to logout->relogin to get it working straightaway.
hth