Help please with template

Hiya Adam29738040qpvs!

It looks like the template you downloaded is a mockup with smart objects. Smart objects are layers in Photoshop that contain image data from raster or vector images and can be edited without altering the original image. In this case, the brochure pages are smart objects, and you need to double-click on the smart object layer to open it in a separate document window.

To edit the brochure page, select the smart object layer in the Layers panel and double-click on it. This will open a new document window with the smart object layer contents. You can then replace the placeholder content with your own content by pasting or dragging in your images, and then save and close the smart object window. The changes will be automatically applied to the original template.

Once you have made your changes, save the file and you should be able to see your image on the photorealistic brochure template.
If I misunderstood the question or you’re still running into issues, drop some more info on the situation and we'll find out what the culprit is!
Highest regards,

-iDAC