Google Contacts, the address book built into Gmail, lets you keep track of all your contacts, see when you last interacted with them, and more.
Assemble project PDFs in the page order listed on each request.
Your report or invoice packet is ready on the same spreadsheet row as the source PDFs, with its pages in the order you chose.
Combine project PDFs in manifest order and send the owner a link.
Get PDFs merged in the order you list. The folder owner gets a link in chat. You choose where the finished file goes.
Put text from linked document images on the review task.
Get the words from linked images on your review tasks, in reading order, with unclear passages flagged for a closer look.