uploadId already produced a version. The error message names it. Open a new upload
session (POST /datasets/{datasetId}/uploads) for anything new.
The uploaded file is many times your tier's size limit for a dataset. The limit itself applies to the stored size, which is known only after conversion, so an upload that passes here can still end failed when ingest finishes.
Your account's total storage limit (GET /account's maxTotalStorageBytes) is
reached or would be exceeded. Delete a dataset to free space, or upgrade.
No such dataset for this user;
uploadIdwas not issued for this dataset (never minted, or minted for a different one); or nothing was PUT toupload.urlyet — a finalize with nothing to finalize.