Clear all the entries from the Tracker.
In Acrobat, choose View > Tracker > Right Click each of the files>Remove from Tracker.
When you open a PDF saved at any location and click Send for Shared Commenting, you receive an error: The file destination provided is not valid. Enter a valid file location.
This issue is caused because of corrupt preferences.
Follow the steps below to fix this issue:-
Clear all the entries from the Tracker.
In Acrobat, choose View > Tracker > Right Click each of the files>Remove from Tracker.
Remove Custom Server Locations
Restart Acrobat and set up a new Shared review.