Upload failed while saving the file
The Member API single-shot upload aborted while writing to storage (local write stream or remote writeStorageObject).
Why this happens
Interrupted stream, storage node down, network drop to CDN/S3, or pipeline/throttle errors (size overruns use a 413 size message instead). Distinct from “could not verify” (post-write stat failed).
Diagnose and fix
1. Servers — assigned node online; CDN credentials OK; disk free.
2. Retry a small file; if only large files fail, check timeouts and upload speed caps (ul2_up_speed_kbs_*).
3. App logs for the storage write error at the same timestamp.
4. Confirm Member API upload mod and uploads enabled for the tier.