To drag and drop one or more attachments:
Note: Remember that while you can attach multiple files, the maximum total attachment file size, inclusive of all attachments and the content of the message, is 25 MB.
To send a message without a file that has been previously attached, uncheck the box to the left of the file before sending the message.
Drag and drop attachments from a message
To drag and drop attachments from a message to your desktop or another folder, open the message, then:
Note: Remember that dragging attachments from a message is currently only available using Google Chrome and Mozilla Firefox 3.6 or later