Hi Eslam
Hope you are doing well and sorry for the trouble. As described you are unable to open the PDF while online.
Would you mind explaining a bit more about the issue you are experiencing so that we can look into it and assist you better?
What is the workflow/steps you are doing to open the PDF file? Do you get any error message? If yes please share the screenshot of the same for a better understanding.
If the PDF file is stored on a shared network/drive please download the file to your computer first and then try to open it with Adobe Acrobat/Reader DC and check .
Please check out the steps shared in the help page https://helpx.adobe.com/acrobat/kb/cant-open-pdf.html and see if that works.
Regards
Amal
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