Hi, I can understand your question as using apps on multiple devices is common nowadays. For the Roborock S6, this is also possible. You can install the app on multiple mobiles and log in with the same user account to synchronise settings and programming.
For example, you can download the app from the Google Play Store for Android devices. After installation, you create a user account that you can then use on all your devices. The key component is that you always log in with the same user account to ensure synchronisation. Here is a short description of how to do it:
https://andersenlab.de/services...Personally, I have used this function with other smart home devices and it has worked well. It makes it easier to control because you don't have to do the settings on each device separately. So remember to always log in with the same user account to ensure a smooth experience.