Conversion of zip files to obb file format

It doesn't look out that it's possible to convert random .zip archive to Android .obb package, which is what zip to obb conversion essentially represents. Nevertheless, if the content in the .zip file is really for one of your apps (.apk), it usually means that there is .obb file inside the ZIP archive. You will need to extract the .zip file first and then place it in the default obb folder on your SD card.

Open ZIP file    Open OBB file