I don't know the state of the work on this feature, but it is in development, with at least a couple things you can try. In the Editor, under game settings, there is a choice for "Network". Choose "Local Evaluation" and also check "preload media". This may not entirely untether you but it may be close enough for your particular scenario. Be aware though, that certain ARIS features, especially factories and multiplayer dynamics really don't work well here. Also know that for Notebook uses, one can always collect media out in the field and use ARIS when you get back to a network.