Correction: The A and B in the image are reversed. I only noticed this after uploading and can't eit.
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When you open a file in PS he "reads" it as a raster image that you can modify, but when you import other files in this document, the software will read them as smart object (if you don't want this option, go to the end of my post).
Smart Objects are layers that contain image data from raster or vector images, such as Photoshop or Illustrator files. Smart Objects preserve an image’s source content with all its original characteristics, enabling you to perform nondestructive editing to the layer.
You have two ways to edit a smart object:
WAY 1 - keep it as a smart object and preserve it (for istance if the layer is a vector)
- Select the Smart Object from the Layers panel, and do one of the following:
- Choose Layer > Smart Objects > Edit Contents.
- Double-click the Smart Objects thumbnail in the Layers panel.
- In the Properties panel, click Edit Contents.
- Click OK to close the dialog box.
- Make edits to the source content file, then choose File > Save.
Photoshop updates the Smart Object to reflect the changes you made. (If you don’t see the changes, make the Photoshop document containing the Smart Object active.)
WAY 2 - make a raster image from your smart object:
- right click on your layer
- rasterize layer (or choose Layer > Rasterize)
If you don't want your images to turn into Smart Objects then disable Place or Drag Raster Images as Smart Objects from Edit->Preferences->General.
If you want to learn mor about smart objects, please read https://helpx.adobe.com/photoshop/using/create-smart-objects.html