Attachments: Up to 2 attachments (including images) can be used with a maximum of 512.0 KiB each and 1.0 MiB total.
What are you trying to test? An apk that is available through the Amazon Appstore is the same apk that the developer uploaded during the submission process.
1 Person is following this question.
How do I stop the Splash Screen from displaying when a user presses play (Fire App Builder)
Display Toast Duration is less
Setting up testing for FireTV App
Is It possible to play two videos at the same time on a fire TV app?
SSO whitelisting for Fire TV app