Yes, thanks for the reply, this works in some cases but my main question was about smoothing the workflow while dealing with a lot of different sizes. I know that using only svg-s would be my best option but that is not possible in all situations.
The ideal case would be (in future updates ofcourse) to have Hype export (png, jpg, gif) img assets no larger than the maximum size used in animation. For instance if i have a 500x300 banner ad and I use 300x300 element that is scaled no larger than 50% at any time, there should be a global option to have that element exported as 150x150 because there is no reason to have a larger resolution (lets leave @2X out for now). The same with all the other used elements.
I hope you understand my point of you, English is my 7th language.