Meaning of file in

1. Please remember to file in your expense reports by the end of the week.
2. The students were instructed to file in quietly and take their seats for the exam.
3. The receptionist asked visitors to file in one at a time for check-in.
4. Make sure to file in all the necessary paperwork before the deadline.
5. The employees were asked to file in to the meeting room for the presentation.
6. Don't forget to file in your tax returns before the deadline.
7. The teacher asked the students to file in their homework assignments at the beginning of class.
8. The parade participants were instructed to file in behind the marching band.
9. The librarian reminded patrons to file in their book returns in the designated drop-off box.
10. It is important to file in all the necessary paperwork for your insurance claim.