During testing of Engage when I uploaded a second chapter from the same publication, the message received on the reading list side says Upload Successful, despite the TACC request being referred and the reading list showing "Copyright Review Pending".
The message refers to the file upload itself, rather than the request to use it in Engage, but I think it is misleading. Amending the last line of text to "If your library has copyright clearance in place, this item may need to be checked for compliance before it is made available on the reading list" would manage uploaders expectations and help them understand what it happening.
Thanks for your feedback, we will consider this when iterating on Talis Engage later this year. Thanks, the Product Team