PDF (adobe.com)

Replace the contents of a Smart Object

You can update the image data in one or multiple (if the Smart Objects are linked) instances of a Smart Object.

Note: When you replace a Smart Object, any scaling, warping, or effects that you applied to the first Smart Object are maintained.
  1. Select the Smart Object, and choose Layer > Smart Objects > Replace Contents.
  2. Navigate to the file you want to use, and click Place.
  3. Click OK.

    The new content is placed in the Smart Object. Linked Smart Objects are also updated.