Seems to be working with JLCPCB and PcbWay. Tried the recommended way in Gerber spec, did not work. Just drawing lines work. Not clear why Seeed studio complains about nonexistent outline layer: tried every possible name and extension. Conclusion: Seeed Gerber viewer is off.
Seems to be working with JLCPCB and PcbWay. Tried the recommended way in Gerber spec, did not work. Just drawing lines work. Not clear why Seeed studio complains about nonexistent outline layer: tried every possible name and extension. Conclusion: Seeed Gerber viewer is off.