The technical details are irrelevant.
Recruitment agency sends you CV. That CV has all names, address, phone numbers and email addresses removed. This is to stop the recruiter from bypassing the expensive agency and contacting the applicant directly to save agency fees
Next, no age or DOB is displayed. That's against the equality act here.
Next, the recruitment agency pastes their logos at the top of your CV for advertising purposes
End result is that your CV looks nothing like it did when you sent it. The formatting is broken, it prints over 6+ pages. That's why they don't take PDFs, as they can't edit it.