Export RAW files from iPad to NAS

Hello everyone,

I've been a while wondering if it is possible to quit personal computers for my Photo Workflow, that involves RAW file formats. The ideal workflow should be like this:

1. Take a photo in RAW+JPEG.
2. Import the photo in an iPad Air 2 with iOS 8 via SD Card Adapter.
3. Work with the image with the existing RAW editing apps, Like Photogene 4 or SnapSeed.
4. Save the original RAW and edited stuff in a Synology NAS.

The problem is the fourth step. It's impossible for me to extract them intact from iPad to NAS. I had recently a false positive when I found FileBrowser, which is a Finder-like app that let's you take RAWs from an album and copy to a network storage. BUT surprise! The filesize of that files is EXACTLY the same of the JPGs, around 2,5 MB, so these .CR2 files have been altered.

¿Is there some way to export RAW files from an iPad?