When you post a question, please provide sufficient context, so you can receive adequate help. The issue is often the wording of the sentence, not the individual terms.

The verb "to file" is used for submitting any kind of papers to the court.

If the papers submitted represent a new action, we call it a suit or a lawsuit (one word). If it is a request in the course of a lawsuit, we call the papers a motion.

The rest of the sentence is straightforward. The key word is "uphold."

You can google these words around to see how they are used in context.