Create a short-lived upload for a worker that should not hold your full API key.
Advanced only. Prefer beecargo_upload for normal agent uploads. Use this when a separate worker must put the bytes, but must not keep your API key. You get a short-lived upload URL and a delegation token; the worker uploads, then completes the job with that token.
API key required. Anonymous callers cannot create delegations.
POST https://api.beecargo.net/files/upload-delegations, then complete with /files/upload-delegations/complete (multipart helpers exist for large files)./d/{shortId}). Hand that to humans.beecargo_upload with a public url is simpler and enough.