This is a big one. Right now, the teamlink view for external parties is a bit messy in my opinion. For example, when sending an RFI the request is collapsed by default so someone needs to expand it to view the request. It would also be nice to be able to move some of the sections around so that linked files are not all the way at the bottom and company contact info doesn't take up so much space at the top of the view.
Another issue is that when they respond, the button to send their response is labeled as "Save" which is a bit vague. It should say "Submit Response" or something along those lines. In addition, after they hit save, they can click the save button again as many times as they want and it sends an email to the coordinator each time they hit save.