I have an issue where Aspose.Pdf and Aspose.Pdf.Kit are not creating thumbnails for certain pdfs.
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I have tested the scenario where I have tried converting the pages of attached PDF document into JPEG image format while using Aspose.Pdf for .NET 6.3.0 and I am unable to notice any problem. The images are properly being converted. Please try using the new version and in case you still face any problem or you have any further query, please feel free to contact. The resultant Image files that I have generated are also in attachment. Please take a look.
Please visit the following link for details on code snippet that I have used to Convert all PDF pages to JPEG Images