Which files do I need to upload?

Gerber (every order). RS-274X files with the board outline and drill data, in one zip, rar or 7z archive. BOM (assembly). An xls, xlsx or csv file with reference designators, manufacturer part number, manufacturer, quantity, package and description. Pick-and-place / CPL (assembly). A csv, txt or xlsx file with the designator, X and Y position, board side and rotation of each part. Optional. Schematic, assembly drawing, test procedure or photos. Keep every file at the same design revision. Mixed revisions are the most common reason an engineer has to come back with questions.