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Export sensor data as csv file in Samsung gear 2

Hi,
I am developing Tizen Wearable Web app with Samsung gear 2

I want to collect Accelerarator and Gyro data by deviceMotion Event
and export data as a csv file to the gear 2 stoarge.
(Even if gear2 is not connected with mobile device)
When I put the start button, it will begin to export data as a csv file
until I put the end button.

My main problem is :
(1) I try to implement by javascript from some resource on the Internet
But the most of the searching result is not what I want. It seems that most
of the example export table (on the HTML which is input by user) as csv file.
Like this : http://www.raymondcamden.com/demos/2014/apr/3/testdownload.html

(2)I had tried some example like (1) metion. But when I input some data in
the table and export it as a csv file. I cannot find the file which I have just
exported! (I check it in the gear storage) I can't find the output csv file on the
gear device but I can run normally on my browser(Chrome)

How can I fix my problem ?

Thanks for all in advance!