Do we need to provide the Original Notification from China Authority?when applying the F visa?

Hi ! I am a filipino and i have been in Guandong China particularly in Zhuhai and Dongguan City for 6 years and holding a working visa it's just i change my new company and was advised to cancel my working visa to L visa which was tagged on my passport and go back here in Philippines to apply for F visa because i was invited in one school to give some lectures and attend some meetings.

As i have reviewed all the requirements for F visa and since i was in a hurry then so i left China without getting the original invitation letter , copy of school license and hotel accommodation but they tried to scan and emailed those documents. i want to ask only if i could use those scan documents?

Also from the site there's no such requirements listed of the original notification form from china authority but when i visited the china embassy here in Manila that original notification was listed?

Could you please elaborate this original notification because i have only the letter of invitation and other documents? or else i would ask the school to provide that documents.

Thanking you in advance and waiting for your early response.