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"Real-time preview" function not working for MS PowerPoint

Hi everyone. I am currently using Trados 2015 and find the "preview" function very useful. However, the "real-time preview" function only applies to MS Word. For MS PowerPoint, there is simply no "real-time preview" option, and I have to refresh the page every time to see the translated content.

Did anyone else encounter similar problems? How do you work it out?

Ps: My current MS version is MS 2013.

Thanks:)