To upload documents click the upload arrow

This will open up the file select window, select the file or files you want to upload and click ok

You will see a green notification it has been uploaded and the a magnifying glass will show up in the View Column.

Add a file using Drag and Drop

Simply drag a file from your computer and drop it on the corresponding line item.

The line item will appear darker when you are hovering over it with the file or files you wan to add.