- DynamicBearer AuthMethod: La Suite clients resolve tokens fresh
per-request from cache file, surviving token expiry mid-session
- Retry with exponential backoff on all Drive API calls (create_child,
upload_ended) — up to 5 retries on 429/500/502/503
- Token refresh triggered on 500 before retry (handles expired SSO)
- S3 upload retry with backoff (up to 3 retries on 502/503)
- Connection pooling: reuse DriveClient HTTP client for S3 PUTs
- Folder/file dedup: skip existing items on re-upload