Hello Rob_Fabiano__KVH,
We're sorry for the trouble you had, would you mind sharing more details about the issue for better understanding so that we can assist you in getting this issue resolved?
What is the version of Acrobat DC installed? To identify, please take help from the article https://helpx.adobe.com/acrobat/kb/identify-product-version.html
Are you on a Mac or Windows machine and what is the version?
Though you have not mentioned the version of Acrobat DC installed, make sure you have the latest version of Acrobat DC 19.012.20040 Optional update, August 22, 2019
Check for any pending updates fom help>check for updates. Reboot the machine after updating Acrobat and check.
You can set the legacy multimedia player options under Edit > Preferences > Multimedia (legacy) if you know your preferred media player.
Open Acrobat>Edit >Preferences> check Multimedia Trust (legacy) and check what all operations are allowed under it.
For testing purposes, please disable the Enhanced Security and Protected View from Acrobat's Preferences from Edit (Windows)/Acrobat (Mac)>Preferences>Security(Enhanced). disable the preferences>Click OK>restart the application and check.
Note: Disabling the Protected View and Enhanced Security is only for testing purpose, please enable it back.
Are you experiencing this issue with all the PDF files or is it specific to one PDF?
Is it possible to share the PDF file in which you are getting the error message with us so that we can test it at our end?
Share the file in Direct/private message only. To send the private message, click on the message icon on the top right corner of the page new the Profile icon.
You may also refer to Adobe articles for adding multi-media in a PDF file
https://helpx.adobe.com/in/acrobat/using/adding-multimedia-pdfs.html
https://helpx.adobe.com/acrobat/using/playing-video-audio-multimedia-formats.html
Thanks,
Anand Sri.