If you are associating a .pdf file into the parts viewer at the product level, the system expects that you will have a pdf file with the same name as the item number uploaded into the system. For example: If a product has an item number of "202-102156DP", then the system expects that you would be uploading a pdf file to the site that is named: "202-102156DP.pdf"
The files must be uploaded into a specific file in the file manager on your website. This file path is as follows:
[your site id]/PortalManager/AttachFiles/Documents
Within the file system you can upload multiple pdf files at once making it easier than doing these one at a time. The video below shows you in detail how this process works.