Adding a file of any type to a Document is easy, and allows for endless content flexibility.
Step 1: Begin editing the Document.
Step 2: Click the Upload File icon.
Step 3: Drag and Drop a file, or click and select a file from the file explorer.
Step 4: Save the Document.
Step 5: Hit Preview to ensure your file is attached successfully.
Step 6: You should see the item appear as follows:
And that's it! You can click to download the file, and so can anyone who has access to the Document.