If you need to ensure your files are in a widely supported format, you can use screen recording or specialized download tools (like the Chrome extension My Fave TT) to save content directly as MP4 files.
To ensure your MP4 videos maintain high quality when shared online, enable the "allow high quality uploads" setting. If you can tell me:
You can add text to your videos to make them more engaging and understandable. In apps like TikTok, you can use the 'Aa' icon to add text and customize its appearance and position.
(Is it a music video, a lecture, a tutorial?)
(Edit it, find it, watch it, describe it?) I can give you more specific, tailored advice. How to Add Description Text to Your TikTok Video