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Hi Sunny, Thank you for reaching out. I have checked your screenshots and those of size 720px × 1,280px But, I can see that your app is submitted and it's in review now. For your future reference below is the info and guidelines for required assets of an app submission. ------------------------------------------------ App product pages can display a limited number of images, multiple videos for each app, and detailed product descriptions. We also provide a "Developer Info" section where you can provide information about your (or your company’s) development activities. You may also submit promotional graphics that will make it easier for Amazon to feature your app. While we encourage you to submit as many merchandising assets as possible, the minimum assets required for submission are: a small icon, a thumbnail (a larger version of the icon), and a minimum of three screenshots that accurately depict your application. Please be sure that your assets conform to the following specifications: * Image Type : Icon A representative icon for display on the desktop of the mobile device after app installation Size 114 x 114 pixels * Image Type : Thumbnail A larger version of the icon image (this should be the same image as the icon) for use in search results and on product detail pages Size 512 x 512 pixels * Image Type : Screenshots A minimum of three app screenshots and a maximum of 10 for use on Amazon.com product detail pages Size: 480 x 800 pixels or 800 x 480 pixels (portrait or landscape orientation), before removal of the OS status bar (e.g., clock, battery, and reception icons) * Image Type: Promotional For use in promotional placements Image Size: 290 x 140 pixels (landscape orientation only) *Image Type: Promotional SQ Please provide a square version of the promotional image for use on Amazon’s homepage if the app is featured there (apps cannot be featured on the homepage without this image) Image Size: 512 x 512 pixels 1. Image Type Guidelines * Icon image files must be PNG format to support transparency * With the exception of app icons, image files must be JPEG, PNG, or GIF (no animated GIFs) * Image files must be either SRGB or CMYK color mode 2. A Note on Icons and Thumbnails The thumbnail is a larger version of the icon for use in search results and on product detail pages. The thumbnail should be the same graphic as the smaller icon image. Please be sure that the thumbnail is clear and sharp. Please do not scale up the PNG image of your icon for this purpose. Doing so results in a blurry image. 3. A Note on Screenshots * Material that is subject to copyright, trademark, or other intellectual property protection should only be included if you own or have obtained all necessary rights and licenses * The screenshots must be unaltered images from the app that are indicative of the user experience. They should not contain additional text, graphics, or inset images * If the app doesn’t use the full device screen, please crop the OS taskbar (e.g., clock, battery, and reception icons) from your screenshots. This generally reduces the size of your screenshot to approximately 480 x 760 pixels (or 760 x 480) * If your screenshots will display personal information (e.g., account names, log-in information), please populate the fields with dummy information. If the app requires you to input information to demonstrate its functions (e.g., a social-network feed, recent searches, etc.), please populate those fields with dummy information representative of the typical customer experience 4. Suggestions for your Screenshots * Highlight the app's most interesting features in a logical progression that mimics a typical user's experience * Focus on the app's core functionality, while touching upon one or two of its less prominent features * Begin at the broadest area of user interaction (e.g., the main menu). Comprehensively document the app's main feature(s), and explore the app's peripheral features, menus, settings, etc. * If the app allows switching between portrait and landscape modes, be sure to consider which layout best accentuates the app's features. Please feel free to alternate between layouts when taking screenshots * Please don't include an excess of information with each screenshot—give each feature enough room to be informative yet concise 5. Video You may also submit up to five videos to help merchandise your app(s). When available, we will use videos in your app’s product detail page. Videos will be embedded, so it’s important that you save your video to the specifications listed below. * Max File Size: 30 megabytes (MB) * Max Duration: 2 minutes * Format: H.264 MP4 * Resolution: 720 x 405 (16:9) * Bitrate: 1200 kbps 6. A Note on Videos * Please be sure the video is indicative of the user experience. It may contain additional text, graphics, or inserted images. * If the app doesn’t use the full device screen, please crop the OS taskbar (e.g., clock, battery, and reception icons) from your video. However, if the OS taskbar disappears and reappears during normal app function (e.g., a video app), please do not crop the OS taskbar * Material that is subject to copyright, trademark, or other intellectual property protection should only be included if you have own or have obtained all necessary rights and licenses * If your video will display personal information (e.g., account names, log-in information), please populate the fields with dummy information * If the app requires you to include information to demonstrate its functions (e.g., a social-network feed, recent searches, etc.), please populate those fields with dummy information representative of the typical customer experience and in compliance with the Content Guidelines for Amazon Apps. There are multiple screen sizes and resolutions for Android you should consider when creating your APK. The primary screen size categories: * Small screen * Normal screen * Large screen * Extra-Large screen For each screen size category, the device's display may be: * Low density (120 dpi) * Medium density (160 dpi) * High density (240 dpi) * Extra high density (320 dpi) -----------------------------------------------