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You can upload PDFs or other documents or multimedia files and provide links to those files within your store.
First upload the file to the Store Files area (Files area for Store v.1).
Click the Store link.
On the Edit page:
Note: If you click on the link in Store Editor, you'll be taken to the Edit page for the link, rather than to the link destination. Be sure to test your links in your published store to make sure they work correctly.
Note: You can also add text links for the files using HTML. Learn more.