Pdf file not display only empty screen

[Manovee]

Hi, i clicked the course unit attachment file(pdf) but not coming the pdf file....only display empty screen... See the screenshot -> http://prntscr.com/mqomth see the empty screen screenshot -> http://prntscr.com/mqonjq please reply quickly and solve the error.  

[Scott Lang]

Refer this link :  https://wplms.io/forums/topic/pdf-attachments-are-not-loading/

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