This app is pretty self explanatory. If you need to link to a file on your website, this app provides you with an easy on doing just that. For example, if you'd like to set up a link to a pdf or word document, this app is for you.
Just click choose file, find the file that's already uploaded to your website, or upload it by clicking browse, finding the file on your computer, and then upload. Choose the file by left clicking the file, and selecting 'choose'. Next, type the text you want to be clickable, and click add. Your file will now be downloadable.
Of course, if you'd like to, once the block is set up, you can move the block around the page by selecting move, and dragging the block around.
Alternatively, you can always just add a file directly from your content app. While you're in your content block, just click 'add file', and then choose an upload just the same as before.