From website to cordova app: How to cache uploadable images?

On my site a user can upload images in the admin panel that are then displayed on the website.

I use

yogiben:admin
yogiben:autoform-file@0.3.0
cfs:standard-packages
cfs:gridfs

for this. The problem is that in the cordova app those images are not cached in AppCache, i.e. the app has to be online to work.

I tried groundDB but couldn’t get the Image collection grounded.