How to have an adjustment layer work below a smart object layer
I have Photoshop 2020 and I am trying to understand how to use smart objects. I am unable to figure out how to have an adjustment layer display below my smart object layer. In many training videos I can see that there is a curves adjustment layer, for example, below the smart object layer. But, I am unable to figure out how this is done. I can do the filters with no trouble, I just can't do any adjustment layers. I can see how to convert an adjustment layer to a smart object, but this layer displays independently from the smart object layer.
Is it no longer possible to have adjustment layers displaying below the smart object layer?
