You're referencing Rule 5 so I presume you are in Federal Court. Assuming that you are procedurally entitled to file an Amended Complaint, then service on the opposing attorney is proper. See Rule 5(b)(1). Federal Rules of Civil Procedure do not govern actions brought in the Pennsylvania Courts, but the answer is the same.
Federal Court is a scary place to be without an attorney. I would recommend you seek counsel.
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I agree with Attorney Sheilds make sure you are following the proper procedure and that if you are in fact in federal court, you had leave to amend and then followed the proper procedures under rule 5 for serving the attorneys.
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As the other attorneys have indicated, make sure that you are reviewing the correct rules of procedure. If you are in state court, then the federal rules do not apply. Also, ensure that you are allowed to file an amended pleading. If an answer was filed before the amended pleading, you were required to file a motion to amend
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