Click Build > Generate Signed Bundle / APK

Select Android App Bundle and click Next

Click On Create New or if you are updating the app click choose existing

• Select Keystore Path
• Enter the Keystore password and confirm the password
• Enter any name for the alias
• Enter the key password and confirm the password
• Choose Validity Years
• Fill rest of the details and click OK

• Enter Keystore password, alias name, and key password
• Select Export encrypted key
• Choose the path and Click on Next

• Choose the signed Bundle destination
• Select Build Variants (release)
• Click Finish

Note:- Please save the Keystore and remember the Keystore password, alias, and key password. If you want to update the app in the future you have to use this Keystore. With the new Keystore, you cannot update your app