I want a single code-base app (React Native or Flutter is fine if it meets Apple and Google policies) that lets my users save any public video or audio they encounter online—Instagram Reels, YouTube clips, Facebook posts and beyond—directly to their device. The app must automatically detect the highest available quality, then offer MP4 for video and MP3 for audio before placing the file in a tidy, built-in library. The admin could see each user link they downloaded in a admin dashboard where he could see all people whom they are using the app. Core flow • Paste or share a link into the app • Choose format (MP4 or MP3) and resolution/bitrate • File downloads in the background, lands inside an in-app folder structure the user can rename, move or delete • Play instantly through the integrated player or export to the camera roll / files Account & membership People create an account with email, Apple, Google or Facebook. A membership layer should gate premium perks (for instance: simultaneous downloads or folder sync). Stripe or in-app purchases will be wired later; for now, stub the subscription logic so it can be toggled on. Acceptance criteria • Runs smoothly on iOS 15+ and Android 10+ • Successfully pulls Instagram, YouTube and Facebook content • Delivers MP4 or MP3 exactly as selected, no format drift • In-app player supports seek, skip and background audio • Local file manager offers rename, delete, move to folder, share • Clean, modern UI—I will supply color palette; you handle responsive layouts • Source code handed over in a private Git repo, clearly commented Please keep third-party libraries lightweight and ensure any server component (if needed for processing) is well-documented and ready to deploy to a modest VPS.