I hereby certify that I am not simply asking someone else to design a footprint for me.
Nope, no footprint needed. Somehow I have a hidden connector, I guess, in a schematic, and when I try to update the pcb from it, the pcb stubbornly refuses to see the new connections. I wanted to replace a set of (1) 12 pin and (1) 4 pin connectors with a single 16 pin header. I deleted the old symbols and tied on to the traces to the new symbol. Everything looks connected just fine on the schematic. The schematic was re-annotated and just the new header is in place. When the pcb updates from the netlist, though, the old connectors are still there and nothing is connected to the new header at all. Any ideas to try? I’ve been at this for a couple hours now.