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Hello everybody. I need help regarding expansion files. At my wit's end here, because the game just can't detect the existence of the expansion file.

I have made a game .apk for Android phone, and need to use expansion files for the assets (200mb).

My main .apk package name is:
com.bitbit.santai
I exported it, and installed it directly to my phone (not uploaded to Google Play yet).

My expansion file name is:
main.1.com.bitbit.santai.obb
I put all the assets folders and files in a folder named "TEMP", zip it uncompressed with 7z in .zip format, and renamed the resulting TEMP.zip to:
main.1.com.bitbit.santai.obb
Then, I put the .obb file inside Android/obb/com.bitbit.santai/ , which is a directory in my phone internal storage.

In the main game .apk, I tried to test whether expansion file successfully loaded with:


But the GetExpansionFileState() only returns 1, which means the game can't detect the expansion file.

Why does this happen?
It does'nt matter if I specify the app version or not while exporting, the game still fail to detect expansion file.

What did I do wrong?

Thanks in advance.

1) You never set the value of expansiontest in your while loop
2) I think expansion files are mean to work directly with Google play

@blinkok
I made that code just to see the status of expansion file state, which will be returned by GetExpansionFileState() in the while-loop. I didn't mean for it to progress/do something else.
expansiontest variable is just there to preserve the loop

Expansion files are supposed to be able to be tested directly by placing them in that obb folder, just like in the documentation.

Probably I should make the expansion files directory structure to be more simple, without the subfolders. Will try again later

With further testing, It seems like the expansion file cannot be detected if tested locally. An app need to be submitted to Google Play along with it's expansion file for it to be detected.
Even if we try to manipulate the expansion file (delete, replace) AFTER downloading+installing the whole package via Google play, the detection will still fail, as if the expansion file was never there. It will only be detected if the app comes with the unaltered original file downloaded from Google.

Which means, we can't test the project locally to see if the expansion file is working properly, before uploading it to Google Play. We can only test it by uploading the whole package to Google Play.