I think its better to contact IRCC directly on this and see if they can provide you other options to prove your job offer authenticity. apologies as i am not so sure what to advise you on this.Thank you.
Unfortunately I saved both signed and unsigned using the same file name.But the area I stored them in the computer shows its the unsigned one I uploaded.
Is there any other thing I can do to reapply besides uploading the signed one?