When boards and assembly come from different suppliers, a file question, a part shortage, or a board defect turns into a three-way conversation, and the schedule slips while everyone checks whose side the problem is on.
With one supplier you send one set of files and get one schedule and one contact. KYNEX handles PCB fabrication, component sourcing, SMT and DIP assembly, and testing.
For a complete PCBA quote, send the Gerber files, the BOM, and a pick-and-place (coordinate) file.