When I try to export files to Photoshop to edit as layers form LRC a box comes up saying Photoshop cant be launched on LR. I tried to use just edit in and edit smart as smart object. Same result. Photoshop does open seperatly but only on initial start up screen. The files are not exported. It makes no difference if Photoshop is already open. All programs are up to date.
The important question here is which hardware. If you use an Apple M1 computer, then this is a known problem. Photoshop is native, Lightroom Classic not yet (it runs under Rosetta 2). That is why there is a problem with the communication between the two.