File preview issue on iOS OS version below 10.0

Hello,

In our iOS native app we are using UIWebview to show file from box. For this we are using this URL 

/mobile/files/box_viewer?file_id=

On iOS OS version below 10.0 file is not getting shown.

When we open file on OS version 9.3.5 device, it shows "generating preview" progress but after sometime blank screen is shown. In this situation if we rotate the device we are able to see file preview properly.

This issue is not present on iOS OS version above 10.0

Along this we are getting one crash while using below mentioned navigation button on file preview screen.It gives us "Memory error" exception on console. This is not low memory crash as we have observed memory graph during file preview.

Does anyone have faced this issue?