Google Play currently requires that your APK file be no more than 50MB. For most
applications, this is plenty of space for all the application's code and assets.
However, some apps need more space for high-fidelity graphics, media files, or other large assets.
Previously, if your app exceeded 50MB, you had to host and download the additional resources
yourself when the user opens the app. Hosting and serving the extra files can be costly, and the
user experience is often less than ideal. To make this process easier for you and more pleasant
for users, Google Play allows you to attach two large expansion files that supplement your
APK.
Google Play hosts the expansion files for your application and serves them to the device at
no cost to you. The expansion files are saved to the device's shared storage location (the
SD card or USB-mountable partition; also known as the "external" storage) where your app can access
them. On most devices, Google Play downloads the expansion file(s) at the same time it
downloads the APK, so your application has everything it needs when the user opens it for the
first time. In some cases, however, your application must download the files from Google Play
when your application starts.
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