Attach It allows you to attach (or embed) any files into your Autodesk® Revit® files. Attached files are saved in the Revit file and can also be reloaded if they have changed on disk. If you use the option to convert a PDF or Excel file to images in drafting views in your Revit file, you can use the Reload command to update these images. To convert PDFs into images, install the free GhostScript tool from http://www.ghostscript.com/download/gsdnld.html