<meta-data android:name="unity.build-id" android:value="...."/> What is "unity.build-id" for? Does the value change every time it is exported?
if you use obb for android, unity.build_id will work, build once, this build_id will change, and will create one .obb file, when load this .obb, will use this build_id to check this .obb file. if not matched, will load obb fail.