Hello Teg,
This behavior is not expected for Collaborator. Most probably, it depends on the workflow that you are using for the process of uploading review materials. To help you solve the problem, we need to get the Collaborator log files so that we could determine the cause of this issue.
Apparently, you can't upload the files in the Community thread, because they contain your company’s confidential information. So, we'll need to open a support case and work on the problem there. I was trying to create a case on your behalf in our system. But, I couldn't find your Company key in our database. Could you please submit a case yourself and specify your company key in the description using this link?
If you don't know your Company key, you may be able to find it at the bottom of WebUI on the home screen by hovering over the "Support until" date. Otherwise, it can be found on the "Admin > Licensing" page. Please note that you will need to obtain this information from your Collaborator administrator if you do not have admin rights.
