How to set default description on YouTube for all new uploads

To set your video defaults:

1. Sign in to YouTube.
2. In the top right, select your account icon click Creator Studio.
3. In the menu on the left, select Channel click Upload defaults.
4. Choose your default settings.
5. Click Save.

Check Youtube help page for more detail.
https://support.google.com/youtube/answer/2660027?hl=en

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