I am looking to migrate my Windows 8 app to Windows Phone 8.1 using WinJS. I had used picker.pickSaveFileAsync in Windows 8 which is not supported for WP 8.1.
I had then referred the official samples from http://code.msdn.microsoft.com/windowsapps/Simple-Imaging-Sample-a2dec2b0
The Javascript version in the sample does not save on Windows Phone 8.1 when the Save As button is clicked and it returns the below error when `getFileAsync is called:
0x80004005 - JavaScript runtime error: Unspecified error
When clicked on Save, it returns a Read Only error. I had tested the sample in Lumia 520 also. I get the same error in the phone.
Copyright Notice：Content Author:「Naveen CS」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/23681662/how-to-save-an-image-in-windows-phone-8-1-using-winjs