Deleting data from container fields
You can delete the content of a container field.
To delete data from a container field:
In Browse mode, click the container field.
To delete data from an interactive container, choose Edit menu > Clear or Cut.
Related topics 
Working with PDF files in interactive containers
Adding and viewing data troubleshooting
Inserting graphics into container fields
Inserting QuickTime movies and multimedia into container fields
Inserting files of any type into container fields
About container fields