Hi,
According to your discription, it seems to be office issue. So I suggest that you can post it in office forum where you can get it better answers.
https://social.msdn.microsoft.com/Forums/office/en-US/home?forum=appsforoffice
In addtion, please refer to the office.js which might can help you:
https://msdn.microsoft.com/en-us/office/dn848361.aspx
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