If you are having issues viewing PDFs from Chinsay it is probably due to your native PDF reader. Chinsay works with most PDF readers but below are some alternatives that are guaranteed to work properly when viewing, sharing or downloading PDFs.
Adobe: https://acrobat.adobe.com/us/en/acrobat/pdf-reader.html?promoid=KSNEW
Foxit: https://www.foxitsoftware.com/products/pdf-reader/
Follow the links and instructions to install them on your computer.