Testing in app update with Internal app sharing

I just started research on the inApp update. all code done as per google document

appUpdateManager.getAppUpdateInfo().addOnSuccessListener(new OnSuccessListener<AppUpdateInfo>() {
        @Override
        public void onSuccess(AppUpdateInfo result) {

            tvPackageName.setText("packagename : "+result.packageName());
            tvCurrentVersionCode.setText("Current version: " + BuildConfig.VERSION_CODE);
            tvAvailableVersion.setText("available version : "+result.availableVersionCode());
            tvUpdateAvailibility.setText("update availibility :  "+ result.updateAvailability());
            tvInstallStatus.setText("install status:  "+ result.installStatus());


            if (result.updateAvailability() == UpdateAvailability.UPDATE_AVAILABLE &&
                    result.isUpdateTypeAllowed(AppUpdateType.FLEXIBLE)) {

                try {
                    appUpdateManager.startUpdateFlowForResult(
                            result, AppUpdateType.FLEXIBLE, activity, RC_APP_UPDATE);
                } catch (IntentSender.SendIntentException e) {
                    e.printStackTrace();
                }

            } else if (result.installStatus() == InstallStatus.DOWNLOADED) {
                popupSnackbarForCompleteUpdate();
            } else {
                Log.e("issue", "checkForAppUpdateAvailability: something else");
            }
        }
    });

but Now very important part Testing in-app update with internal app sharing

for that I follow (Android Dev Summit '19) video of test_inappupdate with internal app sharing*

I did the same as he said but update popup dialog not getting in my app

step 1 : I set test mode from playstore app
step 2 : I upload version code - 10 app at inappsharing
step 3 : share link and download app from link
step 4 : as per android video screen shot said i upload new build with same version.
step 5 : click on new generated link.
step 6 : open app again (but popup dialog not open ,state= UPDATE_NOT_AVAILABLE)

from Testing in app update with Internal app sharing