Upload your app version is a really simple process.
Entering to your account
To update the version in the Play Store, first, go to the next link:
Log in with your credentials, and you will see a screen like this. With all your apps created.
Select the app you want to update.
In the next screen, click in Release management > App releases.
Click in Manage.
And create a new Release:
Upload your version.
And here you are going to upload your ".APK" file (You can drag and drop the file). Automatically will upload the version.
Just add the new release notes (what's new in your app, new features, fixed bugs, etc.).
If you want to publish your app right after the app review, skip the next step.
For manually release, go to Store presence > Pricing & distribution.
Turn on the switch and click in Turn on in the popup window.
Now we can come back to the previous screen. and click in Review
Click in Start Roll-Out To Production
And that should be enough, you can go to all your apps and check that is up to date.
Have a Happy Ordering