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If you are trying to add text overlays to a video file for a post, you can do so through the built-in editors of most apps:

: While viewing a video, you can tap the Share button (arrow) and select a friend from your contact list to send it as a message. 18521mp4

If "18521.mp4" is a video you want to share with someone via text/DM on TikTok: If you are trying to add text overlays

Are you looking to text from a video, or are you trying to add captions to a file you already have? How To Text People or Send Messages On TikTok 18521mp4

If you are looking for general instructions on how to manage text related to MP4 files or TikTok videos, here are the most common ways to handle text in those contexts: