Copying an envelope is only available if the court has rejected the entire envelope/each filing and/or each filing has been cancelled or submission failed. If any part of the envelope has been accepted/receipted or is still pending review/processing, the Copy Envelope option will not be available.
Furthermore, copying an envelope can only be performed one time. When an envelope is copied, a draft is created. You would need to resume the draft in order to continue making changes. If the draft has been deleted, and/or copying an envelope is not an option, you would need to start a new envelope in order to resubmit.
Note: If the envelope was from an existing case (already was given a case number by the court), you can start a new draft by filing into the existing case number provided by the court.