3D PDF's can be viewed on the computer with standard adobe reader but this functionality is lost on the android (and iOS?) version. I suspect the processing power of mobiles and tablets would have originally have made this unworkable but this isn't the case anymore.
I request that this is added as mobile applications are increasing common in the workplace, out on site etc. and would be very useful for those PDFs with 3D models.
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Thanks for your request. We have made a note of the same and shall try to incorporate it soon.