Samsung Galaxy Watch 4 Classic Samsung Galaxy A70

Hi, as a beta tester, I recently bought a Samsung Galaxy Watch 4 classic, with built in oxymeter. I still have a Fossil Watch gen 5 and an Happy Electronics oxymeter I used previously, with full recording functions, and now I can’t find right parameters in order to use my new Galaxy Watch, with or without Happy Electronics oxymeter: recording stops abruptly, without any O² level and sleep recording. Is there a way to send you a bug report, and is there any topic specific about Galaxy Watch 4 and Sleep As Android? With screenshots if possible ? My phone is a Samsung Galaxy A70, and I downloaded and re installed last Sleep as Android beta version.
Merci beaucoup!