high severityDropbox API (files/upload_session/append_v2 endpoint)
Large file upload via upload session fails mid-process with errors like: POST https://content.dropboxapi.com/2/files/upload_session/append_v2 failed with 502 {\"error\": \"Internal Server Error\"} or 503 \"upstream connect error or disconnect/reset before headers\" on specific chunks, potentially aborting the entire upload if not handled.
Root cause
Transient server-side failures (internal errors, upstream connectivity issues) during individual chunk append operations to upload sessions, returning HTTP 502/503 on /2/files/upload_session/append_v2.
Dropbox APIupload_session/append_v25025035xx retrychunked uploadrate limiting