The upload token you use does not exist at all or has expired.
You create upload tokens with the delegated upload endpoint. If you don't specify how long they last, they last until you delete them. If you are having a problem with your token, you may have the token represented incorrectly or you may have created a token that expired. To fetch a new one, you'll need an authentication token, or a refresh token which you can use to retrieve a new authentication token.
- Delegated uploads
- Delegated uploads for videos large and small
- Integrate delegated upload to ingest videos from your users
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