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So you need to have the largest dimension either height or width resized to 200px and the other dimension fall wherever it falls.

Is that right?

 

I don't see how.

An action is specific and will do the same thing over and over.

You can put a pause in the action for user input but you need to sit there and enter the correct numbers.

 

Maybe a script??

I don't know, I know nothing about scripting for PS.