Within your event, go to the "Application" tab, and click "New Form Element". Create a form element labeled "Please Upload The Following Documents", as an "HTML" style element type. Then click "Save".
For each document that you require, create a new form element with the document name in the label. Make sure the "element type" is set up to "File Field" and make it "editable", then click "Save". (This will allow teams to go back into their registration and upload the required documents).
Your application should look like this when complete (as well as any other questions you may ask):
To view the documents that your participating teams uploaded, go to the "Team Registrations" tab within your event. Use the "Show Documents - Yes" filter. Then click "SEARCH".
The documents will show up on the right of the team registration. To view the document, click the "View" button. To approve the document, click the "check mark". To deny the document, click the "X".