Can't update target API

Unity Engine
1

Hey,
3 years ago I’ve created my games on version 5.6.0f3 for android.
In order to upload them again to the Google Play Store, I need to update the target API to 30 instead of 25.
I’ve been looking for a solution and I can’t find one, maybe you guys can help me.
I have the API installed on my PC because I am using Android Studio but the editor can’t find it.
I have a later version of Unity but I am getting compilation errors and I don’t think it is the approach for that.

2

Up

3

I have updated to a later Unity version and now I am having this problem
7017817--830683--upload_2021-4-8_15-37-1.png

I have tried to switch the gradle for gradle 6.5 but I am still getting this message.
Also having those errors aside this one:

7017817--830686--upload_2021-4-8_15-38-7.png
7017817--830686--upload_2021-4-8_15-38-7.png1451×161 24.9 KB