Upload rate limit reached
Multipart part uploads hit an hourly rate limit. Message: “Upload rate limit reached. Try again later.” (429).
Why this happens
Each chunk PUT counts toward upload_source_file_part_rate_per_hour (per user+IP; default often thousands/hour). Huge files, many parallel files, or retry loops burn the budget. Nginx may also return a bare 429. Init/complete use related but different “too many …” messages.
Diagnose and fix
1. Member: wait and retry; avoid hammering failed parts.
2. Admin → Settings → Mods → Upload chunk parts rate (upload_source_file_part_rate_per_hour).
3. Related: Upload starts rate, Upload completions rate.
4. API clients: also check api_upload_rate_per_hour / Member API rates.
5. Reload nginx upload rate snippets if your deploy ties Mods rates to the gateway.