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.
Return revised product images with issues flagged by filename.
Get your image edits back by email, with clear notes on revisions that need a closer look or another input.
Update product page descriptions and verify the live copy.
Keep your published pages current with revised search descriptions, and see which requests need your review.