When you apply to the Regular Force on line, you provide your documents by mail you send the Photo Copies. When You actually go in, in person for interviews and testing you will be asked to bring the originals with you. Unless something truly radical happened since I left my recruiter position three weeks ago, I think the process is still pretty much the same.
You will not need to get another Original Copy for the Regular Force. The reason there are two different systems is that for the Reserves you are:
A) joining specific unit therefore, that unit must have available positions to recruit someone into.
B) Again for the reserves the Age and Educational standard (IN General) are different than the Regular Force.
C) You can join the Res Force at 16, provided you do meet the minimum acceptable standard. Here in NS that is 6 Complete high School Credits. We have had in the past some pretty creative art work being done to Transcripts thanks to modern Computer Equipment. That's why we only accept the Original.
As well for Reserve Units, it is generally, pretty easy to get into see a unit recruiter and get the help and advice that it is needed. Again, unless something has changes since the 3rd of April, the system is not geared to accept On-Line applications for the Reserves. What happens when it does happen is that the relevant CFRC sends the Application by email to the closest Res Brigade or Unit recruiting office. That office will then attempt to contact the applicant to give them direction on how to complete the application. With no contact or replies are received within 30 days a letter is sent to the applicant explaining that he have received their file and attempted to contact to arrange for them to complete the rest of the application, and that their file will be closed in another 30 days from the date on the letter. I lost more than 25 applicants because they followed the wrong advice and/or procedure and we couldn't get in contact with them.
To the Original Poster, get in contact with the Unit that has the Trade/Occupation that you are interested in, and talk directly to that Units Recruiter. They job is to provide Reserve Applicants step by step assistance in the process.