Google Play lists the permissions the Mill app needs when you download the app on your Android. Below is a screenshot of the information given when downloading the app:
What does the Mill app actually access?
Photos/Media/Files: The Mill app requires access to your phone files in order for the app to be able to be installed on your Android device. Photos/Media will not be accessed.
WiFi connection information: The Mill app requires WiFi connection information in order to connect your Mill WiFi devices to your WiFi
Device ID & call information: Google Play requires access to your phone’s Device ID in order for you to successfully download and install the Mill app. Call information will not be