Many people trying to connect Sony smartwatch to phones with MIUI or Xiaomi Phones have faced issue where even after downloading and installing apps for smartphone from Google play store, the apps are not seen on the watch for use.
In this post i will provide simple steps for solving this issue. Please note that this fix requires rooting your phone.
Step 1: Root your phone.
Step 2: Install Lucky patcher (http://lucky-patcher.netbew.com/)
Step 3: Install all the smartphone apps you need from Google Play Store.
Step 4: Select the specific app from lucky patcher's list. Click on tools and select "Move the app to "system/app""
Step 5: Reboot the phone
After phone reboot you should see the installed app on phone. :)