To me, PS is not very intuitive to sporadic users.
I opened an JPEG on layer 0 and added another layer 1.
Both obviously have the same size, so one cannot see layer 1.
I now need to add an image to layer 1, resize the whole stuff and want to move this layer over layer 0.
At the end the whole (layer 0 + 1) should be merged and saved as JPEG.
How to do this? BR