I can’t really help with this at the moment since I don’t know how the scenario runs.
There is no combined module. You likely have to create a presentation first before you can add slides to it.
If you need further assistance,
Did you know, this forum has a Hire a Pro category, where you can post your request for off-site specialised help on other platforms (video call/screenshare/private messaging/etc.)? This may help you get your issue resolved faster especially if it is urgent. It is important to post your request in the Hire a Pro category, as forum members are not allowed to advertise their services elsewhere (like here).
Hope this helps!
— @samliew
P.S.: Did you know, the concepts of about 70% of questions asked on this forum are already covered in the Make Academy. Investing some effort into it will save you lots of time and frustration using Make later!