[Flutter] Releases signed by Google Play. But app upload ERROR, app must be signed

I found this post, but this is for an existing app. Also, not much info and did not solve my issue:
Android Upload Error

I created a new android app store account. I have followed all the steps and information that needs to be filled in. This is now the final upload app bundle stage.

I noticed Google now offered to manage my app signing for me. And so, I enabled this obviously to make my life a bit easier. Why not?

But now, I am stuck trying to upload an app bundle with no signing key because Google so helpfully offers to manage the App signing for me. And now I get an error all apps must be signed before uploading. But google did not provide me with any JKS file for signing.



This is a completely new app. On a completely new account. And to be clear. I have deployed 2 apps in the past on ANDROID AND IOS end to end.

I cannot find any information regarding this issue online. I found some other issues regarding uploads. But nothing specifically regarding this error. Check screenshot I added.

I compiled an unsigned app and uploaded it to the play store account for the relevant app. I expected google to sign the app for me. As they clearly mention that's what they do. Bearing in mind this is a brand-new account. I expected them to provide me with signing key files to download if they wanted me to sign the app myself anyways. Which they did not provide.

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