I might be missing something here, but after selecting the plugin Nik opens and sets up a new layer in Ps and the edit goes as expected. If I select the brush tool the layer is inverted and Nik hands me off to the brush tool. Using the brush tool I can brush in the areas I want. All that is fine, but when I hit apply it merges the layers down so there is no going back. If I do not use the brush tool it saves the layers. The brush tool is not available when working in a smart object.
There also seems to be a bug in that on some occasions Ps opens without displaying the Nik tool bar. I need to test more but I think it is after using the brush tool
I also can not get PS to open the NIK toolbar on startup. I’ve tried toggling the setting checkbox, starting PS stanalone (as opposed to from LR which I usually do), and a few other variations. On occassion, the toolbar appears on PS startup, but not often. Never repeatable.