You need to look at how Odyssey does it.

How to Replace (Swap) a Video File on Odysee

On Odysee (often called Odyssey), a decentralized video platform built on the LBRY blockchain, you can replace the video file of an existing upload without deleting the video or losing its permanent URL, views, comments, or tips — unlike centralized platforms like YouTube.

Step-by-Step Guide

Log in to your Odysee account at odysee.com.
Go to your channel:
- Click your profile icon in the top-right corner.
- Select Channel or navigate to your content list (usually under Publishes or Library > Content).
Locate the video you want to update and click on it to open its page.
Click the Edit button (typically a pencil icon or labeled "Edit" on the video page or in your content management section).
In the edit form, look for the option to replace the file (usually labeled "Change file" or "Replace video file").
Select your new (corrected or updated) video file from your device.
(Optional) Make any other changes such as title, description, thumbnail, tags, etc.
Click Publish or Save to apply the changes.

The new file will replace the old one while preserving the original permanent URL and all engagement metrics. The update will propagate across the LBRY network.

Video Swap bug breaks new video swapping with #10311

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