Resolution: 4K. If document not cropped, it should fill min 90% of this space.
Image Format: JPEG
Image Compression: Recommended 100 or at least 90% as it will affect OCR reading.
Do not forget to add source:
Java
setSource(RequestDocumentSend.Source.A4_SCANNER)
Sending uncropped document images:
Java
setExtracted(RequestDocumentSend.Extracted.NO)
Preferred orientation: