The visa has expired. How can I extend it?

It depends on which country's visa has expired. Suggest asking clearly.

Generally, the list of materials required for visa can be found directly on the website of the visa center in this country. Generally speaking, visas are not directly renewed, and if they are to be extended, they need to be re-submitted.

After the visa expires, you can refer to the following materials. Generally speaking, it depends on which country's visa has expired. If you need to apply for a visa in that country again, you can submit the information online or go directly to the address of the visa center in that country.

The materials required for a visa generally include:

My passport, valid for more than 6 months, has at least two blank pages.

visa application form

bank statement

incumbency certification

Vacation certificate

Household registration book (some need a visa, some don't)

Visa size photo

visa fee

The above are the most basic materials needed to apply for a visa, and the list of specific materials needs to be downloaded from the visa center of the destination country. Minors don't need to prepare too many materials, such as school attendance certificate, birth medical certificate, parent-child certificate of your manager, visa application form, etc.

References:

French tourist visa materials-in-service personnel