How to upload multiple documents

[lookcanada]

I have a question regarding upload of multiple documents upon ITA.
There is an option to upload document. But I am able to upload only 1 document. When I upload 2nd time, 1st document is removed.
For PCC, I have PCC from 3 countries. So I need to upload 3 PDF documents. How do I do it ? Do I need to merge 3 documents into 1 PDF and upload ?

Any feedback how to upload multiple documents ?

 

[Duskyblue]

Yes, you need to merge them.

 

[tejasmhaskar]

Here is the link:
http://www.pdfmerge.com/

 

[lookcanada]

Thanks a lot for the quick feedback !!

 

[pseetha]

I recently got a new passport and all my stampings are in my old passport. Should I upload my old passport? If so, in where?