When the Using the data card in the file or folder is checked in the options, launching PDMPropertiesCard on a file automatically displays the data card defined in the PDM administration of the selected file :

With this mode, PDMPropertiesCard does not allow adding files to the file selection area, only the files or folders on which PDMPropertiesCard has been launched appear in the Files/Folders selection area :

Example with a :

Example with folder selection :