Why does Smart Object automatically crop PNG images with an alpha channel?

[Blissful_Delight5D2F]

When I create a smart object from a layer, it automatically crops out all the empty pixels around the content. I need to maintain the original proportions of the image. How to do it?

[Myra Ferguson]

Smart Objects can increase the file size of the document where they were created, so trimming the transparent pixels helps reduce the file size.

One way to create a Smart Object that has transparency and retain the image size of the original document would be to do the following:

1. Create another layer
   • Either make it a Solid Color adjustment layer or a new layer that you fill with any color
2. Select both layers
3. Convert the 2 layers into a single Smart Object
4. Double-click the new Smart Object to open it
5. Click on the eyeball to toggle off visibility of the solid color layer
6. Save the Smart Object