When the stored token is expired and refreshOrReLogin fails, the
returned error wrapped the original 401 and discarded authErr, hiding
the actionable reason (e.g. "account requires 2FA - please run: rclone
config reconnect remote:"). Wrap both errors so the user sees why
re-auth failed and what to do about it.
Fixes#9583
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Implement multipart upload support with configurable chunk size and concurrency options
Enable OpenChunkWriter with per-chunk encryption
Enhance multipart upload handling with new upload cutoff and error management for small files