Why Apk File Not Installing
1) install google map apis. Android os support its own application format such as “.apk, whereas tizen os. Firstly, make sure that the apk version you want to install is supported by your android version. It was not downloaded correctly.
![How to Install APK OBB+ Data Files on Android Devices[Step by Step]](https://i2.wp.com/thedroidarena.com/wp-content/uploads/2018/05/Screen-Shot-2018-05-24-at-2.58.23-PM.png "How to Install APK OBB+ Data Files on Android Devices[Step by Step]")
In tizen based smartphones,.apk file cannot be installed. Sign the unsigned app 5. Check the storage space and permission settings to install apps from unknown sources on android phones before attempting to install an apk file. If this is the case, the install button will not work.