> For the complete documentation index, see [llms.txt](https://helpdesk.ldtsoft.work/ldt-digital-downloads/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://helpdesk.ldtsoft.work/ldt-digital-downloads/sell-your-digital-products/readme.md).

# How our app works

What LDT Digital Downloads does: attach files to Shopify products and deliver them to the customer automatically.

LDT Digital Downloads attaches files to your Shopify products and delivers them to the customer automatically — by email, on the Thank you page and in the download portal.

### What the app does

* **Upload and attach files** to a product or variant, or attach an external link.
* **Deliver automatically**: after the order, the customer receives an email with a download link.
* **Keep the files reachable**: the same content is on the Thank you / Order status page, in the customer account and in your download portal.
* **Protect what you sell**: PDF/EPUB stamping and passwords, video and audio streaming, limited access time.
* **Sell license keys**, and follow every download from the order page and from Analytics.

### How a delivery works

<figure><img src="https://1863660695-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F6iG7j4lDhziM0FqdCCU8%2Fuploads%2FEbdieESOeNMzQS7ErJBr%2Fapp-flow-diagram.png?alt=media&amp;token=69f57a92-067b-440d-b687-b94938f01f61" alt="Diagram of a digital delivery: Shopify order, the app, the delivery email and the customer download"><figcaption></figcaption></figure>

1. The customer buys a product that has digital content attached.
2. Shopify sends the order to LDT Digital Downloads.
3. The app creates the customer's download links and sends the delivery email.
4. The customer opens the link and downloads the files — no account needed.

### Start here

* [How to create and sell digital product](/ldt-digital-downloads/sell-your-digital-products/how-to-create-and-sell-digital-product.md)
* [How to place a test order to make sure everything work](/ldt-digital-downloads/sell-your-digital-products/how-to-place-a-test-order-to-make-sure-everything-work.md)
* [What can I do on an order page?](/ldt-digital-downloads/orders-and-delivery/what-you-can-do-on-an-order.md)
* [How to add My Downloads page to your website Menu](/ldt-digital-downloads/how-to-add-my-downloads-page-to-your-website-menu.md)