Authentication for large files using Content Uploader and chunk upload API?

I'm successfully completing some uploads using the Content Uploader UI, but occasionally get a 401 unauthorized error for large files (over 1gb).

Am I correct in assuming that this occurs when the file upload length outlasts the token life? If so, I don't see a refresh token endpoint or another way of extending the token expiration either before or during the upload.

Some details:

- Manually generating the JWT token server-side using PHP - no SDK is in use

- Chunk upload API is in use on content uploader, so there are separate calls to the upload endpoint

- Account settings allow up to 5gb per file

Can you point me in the right direction here or perhaps there is another issue causing the authentication error?

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