School policy: Some schools stipulate that the archives of high schools and universities need to be sent separately, because the school thinks that the archives of high schools and universities are different in nature and use and need to be managed separately.

Differences in education system: High schools and universities belong to different stages of education, and the education system and management methods will be different. Sending files separately can better protect students' educational records and privacy.

The needs of archives management: archives in high schools and universities have different contents and importance. Sending files separately can ensure the integrity and accuracy of files and avoid confusion or loss.