As a noun:
* I saved the document to a file on my desktop.
* The police filed a report about the robbery.
* My dentist keeps my dental records on file.
* The lawyer reviewed the files before the trial.
As a verb:
* File your taxes before the deadline.
* File a complaint with the customer service department.
* She filed for divorce after years of marriage.
* I need to file these papers in the right order.
Let me know if you would like more examples or want to focus on a specific meaning of "file".