AssetsTK is the strategy to move files along with your model onto the server that runs your Turnkey application everytime you upload your model.

Your model has a file name ending with either .ecomdl (multi file format) or .modlr (zip format).

You create a folder next to your model file and name it <Your Model file name without extension>_AssetsTK.

Now any files put into the _AssetsTK folder will be uploaded along with your model - and expanded out from your application root.

If you need to put a image in Content folder of your app then create a Content folder in _AssetsTK and put your image in there.

AssetsTK is further detailed in the section on Theme_and_style - but note that that AssetsTK is usable for more things that sending style information to the server.