The error indicates an issue with the Android SDK:

Execution failed for PlatformAttrTransform: C:\Users\REDACTED\AppData\Local\Android\sdk\platforms\android-31\android.jar.

You said you have tried "reloading android SDKs". Can you double-check you did it like suggested in a related Flutter issue:

• so in the Android SDK Manager un-check the Android S SDK (API Level 31), then apply,
• verify the folder is gone,
• then check it again and apply?