When you suffer a work injury, it is your burden to provide sufficient information to document how your job caused your injury. You need to collect all of your medical records, mark your file number on them, and send them all directly to OWCP. If someone at your employing agency instructs you to send your records through them, you may do so, but do not rely on that person to submit your records to OWCP for you. The same goes for your physicians. Even if those offices tell you that they know what to do, it is crucial that you still collect all of your records, mark your file number on the top right of each page, and send them directly to OWCP yourself.
The most common reason for an initial claim to be denied is that the medical information that would have been enough to get your file approved did not get into the OWCP file because the injured worker thought someone else was supposed to do that for them.