Can't seem to find a button where I can export a power app page as a pdf/csv.
Is there any simple way of adding this?
Microsoft released printing feature in Power Apps couple of months ago.
Announcement: Print() screens in your canvas app
You can use Print() function to send any Power apps screen to a printer for printing or to save it as a PDF file.
Open your app in Power apps studio
Select Insert from the menu and then select Button.
From the property list on the top left, select OnSelect.
Enter the formula
Save, publish & play the app.
When you select the button, a default print browser pops up and allows you to choose from the available options to print or save it as a PDF file:
OR you can start with new screen template named Portrait print in your app.
Documentation: Print function in Power Apps