Hey
@Anna Berry, thanks for using Dropbox and posting on our Community!
File requests are used to gather files from others and, currently, there isn't a limit to how many people you can send those out to.
Just note that, in order for your collaborators to see all the files from the whole group, you'll need to put those files into a folder and
share the folder with the others.
If you'd like to grant others with view and download rights only, you can
share a link to the folder instead.
I hope this helps, Anna!