Once a file has been attached to a Phoenix transaction a comment can be added to it. The comment is unique to the file, so that a transaction with multiple files attached could have a different comment recorded for each file. These comments are optional, and only for any extra detail required of the book keeping.
Comments can only be added to a file once it has been attached to a transaction. View a transaction that has an attached file and click on the 
button to bring up the File window. Select a file, in the image below the Air Seeder image has been given a comment of "Example comment". Once the comment is recorded, click the 'Update' button in the bottom right to confirm the comment entry.
