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The best practice is to assume that you should download a video unless you have permission from the copyright holder. For personal, offline viewing of videos you don't own, it is generally considered a violation of YouTube's terms of service, and while it's rarely pursued for individual use, it is technically against the rules. 3gp king youtube extra quality
High-quality formats (4K/HD) take longer to process. A video may initially appear in low quality while YouTube finishes processing the HD versions. How To Upload High Quality YouTube Shorts : Files are tiny, making them ideal for
It uses efficient compression to keep file sizes tiny, making it ideal for transfer via MMS or for use on feature phones. : Files are tiny