There’s always an auto response when you transmit something through the webform. You can also check your spam mail for this response if you successfully transmitted. Of course, the GCKey account can also be used to transmit documents to IRCC.What I did i made two pdf files and uploaded first file and then uploaded second file successfully but there is no confirmation that they received the documents. Secondly is there any other way as mentioned in email to upload your documents through IRCC Secure method means GCkey but my gckey account show only dependennt Who are in Canada and I can’t link my dependent application with Gckey