Can you sell digital products on Shopify?
Updated
Yes, but not out of the box
Yes, but not on its own. Shopify is built for physical goods, so it takes the payment but does not deliver a file. You add a digital downloads app, which hosts the file and sends the buyer a link after checkout. Shopify also charges a monthly subscription whether you sell or not.
That overhead is fine for a real shop and heavy for one PDF.
What it is good at
A proper shop with many products, a real cart, discounts, and a design you control.
It also handles a mixed catalogue well, which is the strongest reason to pick it: physical items and files side by side.
What it costs
A monthly subscription whether or not you sell anything, plus payment processing, plus any paid app.
That is fine for a real shop. For one PDF it is a lot of overhead.
When to pick something else
If you sell a small number of files and nothing physical, a storefront or a community store is cheaper and faster.
Shopify earns its cost when you have a catalogue and a brand, not when you have a first product.