Hello, I am trying to upload the required documents in the Canadian visa process, but their application won't accept any PDF file saying it is "not a valid PDF file". I double-checked every file and they _are_ valid PDFs, I even tried creating a very simple PDF from LibreOffice, but that was also rejected. So, something in their system is broken. Then, I tried the upload using Chromium instead of Firefox, and it worked. I'm not sure what exactly is broken, must be something javascript-related. So, there you have it: if you also have issues with invalid PDF files on Firefox and you are sure the PDFs are not invalid, you can try using Chromium to do the uploads.
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