In the files section, accessible through Settings and then Files, you can upload images, videos and other documents. The image files can then be inserted into products, collections, pages and blog posts. For video files or other documents, for example PDF documents, you can add links to these files in your store's products, collections, pages and blog posts. Click on the Upload files button to get started.

After you have uploaded a file, you will find the address for it in the column called URL. Copy and paste the URL to where you need it.