Reminder: You will use the document post type to add a document in a channel. 
This is the document post type icon.   

In a blog post type, you can create a hyperlink to a file. If the file was uploaded into the app, follow these steps to get the correct link to use. 

1. Login via a web browser.
2. Go to the channel with the document, and then tap the View icon. This will open a new browser tab.
      
3. On the web address bar, copy the link shown onto your clipboard. The link will begin with "https://cdn.filestackcontent.com/"
4. Create or update a blog post. 
5. Type the copy that will be used for the hyperlink.
6. Highlight the copy for the hyperlink, and tap the Create link icon located on the formatting bar.
7. Paste the link that is saved on your clipboard, and tap the + plus.
     
8. Tap the Save button.