If you wish to upload a saved document to your reading list, click the Add items+ button and select Upload a File from the options on the right side.
Either drag and drop the document or select click to browse for a file.
Ensure you select the correct permissions statement for your document from the list of options and complete the required fields before selecting Add & Close.
For more information see the Digitisation homepage
Note: Don't forget to add any notes and tags to your items and publish your list when complete.