Here I am developing Android app with android studio. I turned my google account into a google developer account and then published my app in the play store after signing that app within my computer. After a month I published an update for that app with the same package name. I also upgraded the "Version Name" & "Version Code". I checked the the situation by using a phone which has the initial release of the app, but after I released the update the specific page of that app in play store doesn't show an update button ("open"button is there).
How can I correct this?
Thanks.
If your phone with the "initial release" of the app didn't install it from the Play store, then the Play store won't update it. I suspect this will be your problem.
The Play store will only update apps for which it did the initial install (to avoid treading on the toes of app developers during development or other app stores).
The way it checks for "Did the Play store install this" is "Does the signature of the app match the signature in the Play store" and "does the user on the phone have a record of install from the Play store on their account on any device".