when you try to upload export agreement in chat page, if you upload the file and then press the sent button, a message pops out and says "Please fill out this field" pointing message panel. At this moment when you write sth to message panel, this time sent button is not working. You have to refresh the page, upload the file and then write sth to message panel and then sent button to complete the "uploading flow"
I thought that I uploaded the file after pressing upload button and select the file in the browser but it did not. I got a notice from efabless stating that I need to upload the export agreement file, so I understand now that I couldn't upload back then.
Maybe it would be less error prone if we can press sent button after getting warning message about writing sth to message panel or even we don't need to write anything to upload a file.