You have an Azure subscription that contains an Azure Al Document Intelligence resource named DM.

Azure AI Document Intelligence (Standard S0) enforces input constraints: images must be between 50×50 and 10,000×10,000 pixels and typical file size limits apply (images/PDFs well below hundreds of MB; an 800-MB PDF is far beyond supported sizes).

File1.pdf (800 MB) – exceeds supported size limits → cannot be analyzed.

File2.jpg (25×25 px) – below the 50×50 px minimum → cannot be analyzed.

File3.tiff (5,000×5,000 px; 5 MB) – within pixel and size limits → can be analyzed.

References

Document Intelligence service limits (file size/page and image dimension constraints).https://learn.microsoft.com/azure/ai-services/document-intelligence/concept-limits

Document Intelligence supported file types.https://learn.microsoft.com/azure/ai-services/document-intelligence/overview#supported-formats