Without seeing you document structure its hard to tell you what to do. If the Image layer has a layer mask you need to make sure it not linked to the layers content so the image location size masked does not change. Then use Free Transform on the layer's content hold the shift key and resize the image to fill the location and nor distort. The image layer may be clipped to a layer so it acts as a clipping mask. There are many way to create a composite collage. I have no way to know how the template you have should be populated without seeming the template document.
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