If you're trying to attach the same document to multiple deductions, see our Add a Document to Multiple Deductions article.

To manually add an additional document to an individual deduction, click the +Add Other Document button in the Dispute Information section.

The Add Document window will pop up. Click the Select Document button to select the document from your computer.

Use the Document Type drop-down menu to select the appropriate type and then click Upload.

This will attach the new document in your Available Documents section.