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my original stream is 640x480 and video presets are VideoPresets43.h360 and VideoPresets43.h240 But VideoPresets43.h360 never gets published

hi, these are browser side constraints, e.g. chromium only allows 3 simulcast layers for resolutions with 960 or above. see https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/video/config/simulcast.cc;l=76?q=simulcast&ss=chromium%2Fchromium%2Fsrc

Ahh, thanks for the clarification.