What can be the case with the multi-document management system preview control?

  
More document management can not use the preview control What is the situation?
The first reason why you can't use the preview control is probably because the system does not support Win7 system 64-bit IE browser and can't use the control; secondly, it may be because the Microsoft IE version is too low to use the preview control; it is very simple to deal with such problems. You can use Win7's 32-bit system IE browser; or use Microsoft IE11 and above, IE11 and above will not appear this type of problem.
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