If you are one of those that are still wondering why flash share is not available on Google Play store, kindly note that it still exists but has been renamed to Xender. This is the same reason why Xender Flash transfer app automatically replaces the Flash share app on your phone once you download Xender to the phone.
Xender is available on Google Play store and you can also download Xender for iOS which works on iPhone and iPad.
Xender simply allows you to transfer files over WiFi without consuming data. You can also use it to transfer or share photos, videos, docs etc with your loved ones who have also installed Xender on the mobile phones or tablets. You can also use Xender to transfer files from phones to PC and vice versa.
You can download Xender here.
You can as well still download old Flash share transfer app here.