For a failed upload, note file type/size and the exact message. Check permissions and the correct parent. A scanner rejection requires investigation, not an extension change. For a failed download, confirm the record and attachment still exist and retry once after refreshing; report persistent failure with the attachment reference.
For missing intelligence results, check that the source is visible, supported and indexed. Image-only PDFs require an unavailable OCR path in the current feature. Unsupported files, revoked access and stale/failed indexing are different conditions; do not interpret all of them as “no relevant information”.