When you import a record into your RefWorks account you are only adding the bibliographic information (enough for a bibliography). RefWorks does allow you to attach a document such as a pdf file or an image to a record.
To attach a file to your RefWorks record:
Save the file that you want to attach - this can be anywhere as long as you can locate it again.
Locate the appropriate RefWorks record and go into the Edit page (the pencil icon).
There is a section of the Edit Reference page labeled Attachments.
Click on Browse and locate the document.
Click on Save Reference
A link to the document will appear in your record.