The file storage fee kept in the school is relatively cheap, but it is not counted as the length of service. If you want to calculate the length of service, you need to keep a file in the talent market or the employer (many units don't have a personnel department, so a considerable number of graduates will choose the talent market).

PS: According to the law, four years of undergraduate service is counted.

In your present situation, you can temporarily put the file in the school and transfer it to the talent market after signing the contract or determining the next unit.

In fact, most graduates who usually leave their files at school have not found suitable jobs for the time being. After finding a suitable job, you can move the files out.