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I have hard time understand but hope this helps:

Image > Image Size - takes whole image (document) with all layers as one. You can't resize one layer, for example placed from anther document and resize it using this command - it appears as nothing is changing because proportions of layer to documents stays the same only overall dimensions change.

Another thing is resampling checkmark in this window (Image > Image Size). Because you may be changing just the size of this document when printed but changing its PPI, which just changes density of pixels which decreases or increase size when printed bot not visible change will occur on monitor because number of pixels is not changing.