First thank´s for the great framework.
I write an Ionic app and could not download and store pdf files into WP8.1.
Into android it works fine, i point to the Downloads directory but always stops on the error section. I am using cordova file and file-transfer.
If you know how can it work at windows phone 8.1 please let me know.
Here is a link where i define a service called pdfService and then in the controler just call the methods :