Sing Apk Certificates error

When my application update in google console then say sing apk error certificate! Plz solution it
Note: Same app,same gmail,makeroid aia project no other flatfrom aia file!

When I’m update and upload into console it totally certificate error!
My 15+ face this certificate error!

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same here…different certificate error

before you upload your apk upoload you keystore file what you used for playstore.
Sometimes the system make a new keystore and so it does not work to update a app

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So how can we update