UEM don't capture anything from program files as it don't support this folder token.
You can put the file under %userprofile%\AppData\Roaming\Adobe\Acrobat\DC\Stamps and then capture it with a custom config file in UEM manager. Something like this:
Mark the post as helpful/correct if it answers your query.
You can also point directly to <AppData>\Adobe\Acrobat\DC\Stamps which translates to %userprofile%\AppData\Roaming\Adobe\Acrobat\DC\Stamps.
If it is one specific file you need to export/import, I would recommend changing the setting in you config file to the following to prevent possible profile bloat:
If you want to have the Adobe Stamp PDF file(s) directly availably for your users you can use Predefined Settings --> Create Predefined Settings or use Files and Folders --> Configure Files and Folders