Документ PDF стал отображаться в виде иконки вместо миниатюры! Что делать?

Hi there 

Hope you are doing well and thanks for reaching out.

Has this issue started occuring recently or was it happening earlier as well? What is the version of the Acrobat application and the OS you are using? Go to Help > About Acrobat and try updating the application to the latest version available.  Go to Help > Check for updates and reboot the computer once.

Also go to Preferences (Ctrl,Cmd+K) > General > Select ‘Enable PDF thumbnail preview in Windows Explorer’ > Click OK and reboot the application and see if that works.
 

Let us know how it goes. 

~Amal