Limit the number of files uploaded, and not just total size, and expiration date in file requests

I have a team that repeatedly uploads excessive images.  Yet, I keep getting way more than I have asked for and I'm at my wits end.  I ask for 100 images, and I regularly get far more than that.  I have told them for years, and it keeps getting ignored. It's time to put a stop to it but I need help. 

I have worked for GoDaddy in years past and they had a system for me to upload my files to and it had only enough room for their requested number of individual files.  It also had a time limit and if I didn't upload by a specific date/time the link would expire... and I'd love that also because sometimes I can't get my team to upload their files within 2 days as I have repeatedly requested.  

So, I would think it would be possible for Dropbox to allow us the ability to send out a new fresh file request with only enough room for a set number of images, please don't limit the file size, just the number of individual images.  It would be awesome if we could set an expiration date for the link to be upload able... but please make sure the images don't expire once they are uploaded.  I just want the team to hurry up and upload their files so they don't lose them.