Question regarding various document types

Hi,

We've been testing and looking into how documents work with the ServiceM8 Website and have some questions regarding how contractors would use the website.

Where would they upload documents such as PAT, EICR, EPC and various other certificates?
How would the contractor be able to mark them as being certificates?
What are the various attachment_sources available apart from invoice and quote?
Is there any way of marking a document as a completion document of the work?

Thanks,

Andre Sovde