When a file has finished uploading, you will see a Edit link on the right within your media libery.
Clicking on the Edit link will allow you to edit the Title, Alternate Text, Caption, and Attachment Page Content for a file. It will also provide you with the URL of the file. Here’s an example of the options for an image upload:
We’ve had good success with file sizes up to 1 GB. Remember, uploading big files can take a long time!