@Amit Patil I have seen poor quality documents uploaded into envelopes, especially when the document is scanned. If the issue is widespread with every envelope you receive then I suggest trying a different browser. If this seems to happen once in awhile then I would check on how the document is being added and where the document originates such as scanned documents or poor quality PDFs. Increasing the image quality is the only suggestion I have outside of further investigation into where the file is being created, saved etc.