Question

how to insert audio to all slides in powerpoint 2016​

Answer 1

Answer:

1- Select the slide you want to add music to.

2- Click on the 'insert' tab in the top left corner of your screen.

3- Click on the Audio button to open the drop down menu and then select Audio on my PC.

4- Find the file you want to add and click insert.

Answer 2

Answer:

It is done in the animations Tab (if prerecorded audio is the be given) or else in the slideshow tab-recordings(if natural audio is to be given)

I hope this solves your doubt