74b473e3d7
save() was marking the first N files in a chunk as errored (where N = the error count returned by the backend), but the backend errors are keyed by filename. A failure for file[2] would incorrectly mark file[0] as the error. Now builds a Set of error filenames and matches chunk entries by file.name. Test added: save marks only the file whose filename matches the backend error. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>