How to attach documents to transactions in D365

1. While within a transaction (Purchase Requisition in this case), look for and click on the paperclip icon at the top right of the page. (alternatively, press ctrl + shift + A on your keyboard):

2. On the next screen, click "New", then the file type ("File" for documents, "Image" for photos):

3. Click on "Browse", then choose the file you'd like to upload:

4. At this point, the file is attached to the document. You can close this page by pressing ESC and going back to the transaction you were working on.