A mobile app update does not show the app changes. But a new install or a uninstall-install, shows the app changes e.g. of nanoflows.

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A mobile app update does not show the app changes. But a new install or a uninstall-install, shows the app changes e.g. of nanoflows.   Noticed that after distributing a new apk of our android app, the app displays the new changes only after the end user uninstalls and then installs. Whereas a plain update of app does not show new changes that were added into this new version of apk build.Any pointers on what causes this and how to force uninstall-install when needed? Does incrementing the left digit of version string help in this? After app update the apk versions shows as latest. But the nanoflows behave like older version. Native template is 7.0.13. And Studio Pro is 9.24.22 But a fresh install of the apk works fine. It is the update of old version to new that is not working. 
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