PDF Manager uses standard Windows functionality to allow you to drag and drop documents directly from Windows explorer to PDF Manager.
Ensure that PDF Manager is open.
Open Windows Explorer.
Navigate to the document that you want to add to PDF Manager.
Click the document and drag it onto the open Source Documents tab of PDF Manager.The document is added to the Source Documents tab.
Move the pages to where you want them (see Viewing, moving, and deleting PDF pages).