I recently submitted a CISSP endorsement application. When filling out my Job Description, there was a button at the bottom for me to upload proof of employment. At the time, I didn't have something to upload, so I just clicked "Save and Continue" with only the job description. Later on I figured out how to request/receive an electronically-signed Verification of Employment (VoE) letter from HR, but then when I went back to the saved Endorsement application and navigated to the Job Description page, there was no longer an upload option offered.
I went ahead and submitted the application and it is awaiting review by the CISSP endorser. At what point in this process, if any, will I be asked to upload proof of employment?