How to deal with the loss of patent application documents claiming priority?

Did the email you sent to the Patent Office in September really contain the request for invention patent, and did the request claim priority?

Also, did you pay the application fee in full within two months after the application date in September?

If the above conditions are not met, then the later application will definitely not be accepted.

In addition, it is impossible for the examiner to receive your email directly. All mails sent and received by the patent office are handled by the process department. After receiving the email, the process department will stamp, punch and scan it before sending it to the examiner.

Oh, that's probably because the request was lost in the post.

However, I still feel quite strange. If only the application is lost, then only the application document itself should be left in the email. How did the process department relate your new application document to the previous application number?