The Map Replacement window allows you to configure a map that will appear in replacement of the original layer content. For example, you can replace a blank rectangle image from your layer with a map in your final project. Select the layer you want to replace and click the Map replacement. The following window appears:

Information about the current layer content will appear in the top of the window (position and size). It is important to match the same layer content size and position with the final map size.