📒Can I collect my user emails and send them a free PDF?

Said differently "I want to know if your app can make the customer download a FREE pdf and leave me his email?"

No. The app can not create an email popup asking your customers to leave the email address in exchange for a free PDF.

The app will only send digital products to people having purchased something on your store. Not while they're still browing. Maybe an app like Klaviyo could do it though.