File Transfer- Ionic 2

Hello Ionic community,

I am currently working on a mobile app with Ionic 2 that interacts with IBM Watson services. I finished building the app & everything works fine.
I wanted to restructure my project, I moved the code (http methods & file upload/download methods) to a service & tried to consume them from my component. The problem is its not working anymore, I think there is a problem when you try to consume file transfer from a service (knowing that I coded it directly in my component at first & it works like a charm).
Is there any one to help? or maybe a code example I could look at?
Thank you for you help, appreciate it :smiley: