How to submit expansion files for my app

Uploaded Android binary files (AAB or APK) can be up to 2.5GB in size. Amazon recommends that you deploy small apps that download and install quickly. Then, upon first launch, your app can download additional resources and save them on the users’ local file system. Expansion files or Binary blobs (.obb) are not supported by the Amazon Appstore. If you’re submitting an APK, you must do so without .obb files.