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Got success in uploading and download the Expansion files Apk external data, Android Expansion
but now I am facing CRC while unzipping my files.
Not getting exactly where the problem is, Google rename my files as .obb
Searching for workaround, if any?
Update
Complete explanation defined here Steps to create APK expansion file
I suspect you are having the same problem as this question. In brief, the sample code doesn't work for compressed zip files.
Fixed it, I just skip checking CRC32 algorithm and its working very fine.