Google Drive is Google's file sync app that lets you store all of your files online alongside your Google Docs documents, and keep them synced with all of your devices.
Hand off candidate applications after each deadline with gaps marked.
Get a downloadable CSV after your form closes, with the entry count in its name and missing answers and possible repeats flagged for review.
Add candidate paperwork to the existing review item.
Your reviewer sees missing files on the pending approval item, even when a requester adds them after the review starts.