To Add Files to a Document

Open a document in the Content pane.
Do one of the following:

In the Task pane, in the Edit section, select Details and then click the Edit button. Expand the Files topic. Click Add.

or
In the Task pane, in the Edit section, double-click the Add button.

Note: This icon only appears if you have permission to add files to a document.

If the document contains multiple copies, the menu below the Add button lets you select which copy you want to add files to.
In the dialog that opens, select the file(s) you want to add and click Open.
The file(s) related to a copy labeled ESOURCE_0001 (if a user-defined mask is not defined in System Defaults > Identification) display in the Files topic.

You may need to refresh (<F5>) to see the newly added files.

Tip: You can also add files to a document by dragging files from Windows Explorer onto the Add button in the Task pane.

Note: Adding files automatically creates a Master document copy.