The interface looks like a filesystem hierarchy but the actual mechanics of using it are a little nonstandard and awkward: you have to select the element you want to edit or act on first. For more info, here’s the Media Library Folders tutorial.
WooCommerce Product
Is this a replacement?
It’s up to you whether to just change the link in the current product or to delete the product and create a new one.
In both cases, follow the instructions below to make sure all the tags are correct.
Create or edit the product
Link the product to the media file
Add the price
Price is required, so set to $0 for free downloadable products/resources)
Set the product type:
Downloadable for all PDFs or audio files, even if it’s a free product
Not virtual (virtual is reserved for contributions)
Add three (3) tags and one (1) category to allow the product to show up correctly in searches and filters:
Add the category for literature Type. (12s, Newcomer, Service, etc.)