A popular paid service ($19.99/year) that allows you to upload an IPA file directly to their website and install it on your device without a computer or the risk of frequent "revokes". Safety Warning

If you want to download videos from YouTube or social media on an iPhone, use these official App Store apps instead:

Many users create or download "Shortcuts" (automation scripts) that can handle media tasks directly within the iOS ecosystem. Third-Party Desktop Downloaders: Software like HitPaw Video Converter 4K Video Downloader