Adding a Tab for a Meeting?

[CIH_Yohe]

When setting up a meeting there is an option to add a tab using the '+' feature. 

I uploaded a PDF to this meetings files and then added a PDF tab.  Where and how do my meeting participants get to this tab?  I don't see it when the meeting is started, but when I try to re-add, Teams thinks it's there.

If I can't direct my participants to this, what is the purpose of adding tabs to a meeting? 

[#2]

@CIH_Yohe That looks like it's adding a tab to the Team's channel, rather than adding anything to the meeting itself. Is there a "PDF" tab that's appeared in whatever channel you were in when you were setting up the meeting?