i can't see in Lightroom (Classic CC) a processed and saved Photoshop CC picture.
In that article (Fotos in Lightroom Classic und Photoshop bearbeiten | ) i should see it in Lightroom automatically.
The saved picture is "there" - the Windwos Exlorer i can see it as a tif-file, in the same folder as the original nef-file.
1) to us the LR "Edit-In" method from the menus in Lr to 'open' the photo in Photoshop.
2) to "Save" the file in Photoshop. Do not use "Save As" or try to change the file format.
3) to have the Sort method in the LR grid view set to 'Filename' ('Capture Time' places the new file at the very end of any Grid view.)