Hi CharleneParham,
Per your description, you lose the audio voice when covert pptx to ppt, I have test it on PowerPoint 16.35 for Mac Catalina, I open a pptx file and save as ppt, while the audio voice won’t lose.( If my steps are different
from yours, please point out.)
To narrow down it, I will suggest you update your Office to the latest version and see the if new updates can fix your issue.
For your reference: Update Office for Mac automatically
And also try to launch your Mac with safe mode to isolate issues with your Mac.
Disclaimer: Microsoft provides no assurances and/or warranties, implied or otherwise, and is not responsible for the information you receive from the third-party linked sites or any support related to technology.
If the issue still persists, I would like to know some information to further investigate:
- Your PowerPoint version. Please open PowerPoint> click ”About PowerPoint” and share the screenshot with us.
- Whether all presentations or a specific one has such issue? You can create a new one and check the outcome.
- How you concert pptx to ppt? Please tell us your steps to help us further test.
- Did you get any error message? If so, please send the screenshot of it.
Best regards,
Gloria