[Google Play Store] Updating APK failed

EDIT: Is it true the APK name needs to be the exact same? (if not, read on)

Hi!

Yesterday I was trying out the whole "upload an app to google play store" and I managed to get that done.

However, as I tried to update it with a very slightly different APK, it failed. (same Version)

I realized I had to change my "Version" and "Bundle Version Code", both were at 1.0 and 1.
So I increased them (I now however got a different error...)

Now I get an error about "certificate(s) with fingerprint(s)" ? (see attached picture)
I saved the keystore in a specific folder and I am using the keystore I used for the previous build.
Same as with the Alias.

All I changed was > Build > Player settings > Other Settings > Version & Bundle Version Code.

So, now I have no idea what they mean with fingerprints etc. All i heard was that this is because the Keystore is different, even though it is the same (unless when making a build it automatically overrides the old keystore which i highly doubt)

The Build APK name is also different.


Any help is much appreciated!



Edit: I blacked out the codes since I do NOT know if they are important/private.