how-to-build-an-android-app-client-side-and-server-side-with-the-help-of-Google-App-Engine

[AC Question]

Good day everyone. I am desperately in need of rich and straightforward answers. So, Please For Your Help. I am building for the first time an android application to access diverse files on mobile devices. My idea is to have a client app on the device and an application server on Google App Engine that search effectively the files and answers the client app. I also consider having a data store in Google cloud to store all the files. This might not really make sense because I am not very sure of the way Google cloud works but, may be you can help me with a better proposal to make sense out of it all. Another point is how to make the client app accessible to multiple users in order for them to also use the system and access the files. Is it by publishing the client app in Google play? Thanks in advance for your prompt response.