I 'validated' it and made the necessary corrections. I filled the 5257 pdf that I had downloaded. You will be asked to submit a digital signature once you are ready to transmit your documents to CIC You do not need to sign your application form by hand. Please complete and validate an electronic application form, save it to your computer and upload it You cannot submit an application form that has been scanned from paper You do not get this message always and I do not know what causes this message to pop up. Here is a message that I got in one of my several attempts to upload IMM5257. Hope the following info helps those who try to upload IMM5257 in M圜IC while applying online for Temporary Resident Visa