How to get apk expansion files after installed application?

Question

I use livecode for developed. My project larger than 50MB. It's can't publish to google play store. So I build standalone application without resource files. And I create obb file with jobb.

Step by Step

1. My project package name is com.tester.guru Version name is 3.0 and Version code is 3
2. I set signing to "Sign for development only" (for simple install application to my device.)
3. I set install location to "Allow External Storage"

4. I create obb file with jobb. Command below:

   jobb -d resources directory -o main.3.com.tester.guru.obb -k guruasean -pn com.tester.guru -pv 3

5. Now I have 2 files:APK file and main.3.com.tester.guru.obb file

6. Copy the installation file (.apk) to the SD Card and Install it.

7. Copy the obb file to /Android/obb/

After I do 7 steps and run application. It not show image because image wrong path.

How do I do for solve this problem.