External documents that you receive as email attachments can be filed in document packages. Documents that are generally accessible and should not be linked to a specific record are filed in the "Shared documents" folder.
Double-click the email to open. It is not possible to file attachments from the preview.
In the small pane in the upper right-hand corner, select the documents by left-click, holding down the Shift key for multi-select.
Click on File in document package in the toolbar of the small pane.
Select New document package to create a completely new package.