HI - I am working on a MAC with Acrobat PRO DC. I add watermarks to PDF documents daily but starting today when I click on "Edit PDF" and then the box for "Add Watermark" the dialog box that used to pop-up which allows you to add the watermark is not appearing.
I am sorry for the delay in response.
Are you still experiencing the issue?
You may try checking update for Acrobat and see if that works.
What is the version of Acrobat installed on the machine?
You may refer to this link for the same: Identify the product and its version for Acrobat and Reader DC
You may also try downloading the update from the following link: