Resampling "large" images in overlays

Although this question really belongs in the New authoring tools available (Sept 1) thread as it is related to download problems I thought it should be a new topic as the answer (when it comes) might be of interest to all.
I have a sequence of nearly full screen images in an Object State with the same images scaled to thumbnail size, each one converted to a button. I know that images within Object States do not get downsampled when the Folio is built but do the images that have been converted to buttons?
If yes then I need do nothing.
If no then I will have to resample the thumbnails so that they are smaller file sizes.
Graham

Thanks for your comments guys but I would also like an official Adobe response as well as I have discovered a serendipity feature that I guess is related to this issue.
On the vertical orientation I have a sequence of thumbnail images converted to buttons that show/hide captions (in an Object State overlay) as they are pressed.
Rather than mirroring the layout on the horizontal orientation on this occasion I have those same (landscape) images almost full screen within another Object State Overlay and when a thumbnail is tapped for image 5 for example and then you switch orientation that same image is selected.
I imagine that if I save the thumbnails resampled smaller as they will have different file names that this feature wouldn’t work.

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