Object not smooth when opening in Chitubox from Zbrush

fridles 2019-10-12 1589

My sculpt is smooth in Zbrush and I export as obj and when I open it in Chitubox is it low res poly and not smooth.

I used Polish in Zbrush to make my sculpt smooth and it works.

I attached both photos where you can see the difference. 

I am very new to this and while I can use Zbrush and Chitubox I am not an expert and need someone to please help explain to me what I did wrong and how I can fix it without.  

Thank you.

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