Thanks for the response. Reinstalling the app didn't help - screenshot attached. The menu used to offer Play Next as one of the options when clicking on a song but this seems to have disappeared with a recent update.
I beleive the add to queue option does the same thing as the play next option. My ipad would originally show this option while my android would show play next. However, I have noticed that the online spotify web player has completely done away with the add to queue or play next options all together!
Yeah I thought add to queue could serve the same function but it doesn't, and it doesn't even add the selected song to the end of the play queue so I'm not sure what it is even for anymore. This is all when playing music on shuffle in a playlist, by the way, if that context helps. These functions both used to exist and work properly up until a few weeks ago when I updated.