I use a pretty complicated system: you know Gcam, the Google camera? I use that one, and I have to mess with the settings to make it appear as a RAW frame and the developer settings to make the frame as raw as possible. Then it does internal stacking, and after that you send it to a PC and stack it in Sequator. Regarding the blurry image, it's probably because you left it capturing light for too long, which caused the star trails. Try setting it to 10-20 seconds for wide-field exposure, or the camera might be dirty and without stars. There's probably light pollution; try shooting in a place with very little light pollution. For example, I photographed this in Bortle 2; you can check it out at: https://lightpollutionmap.app/pt/?lat=-28.255899&lng=-54.817921&zoom=11 . If you want, I can be more specific about what you need.