Can't Find Tiff Copies in LR

Just getting started. Using LR Classic I can get to the point of converted positives in LR that look quite good but I want to edit them in LR. At conversion I ticked the box for TIFF copies but I can’t find them in the Library or Develop modules. In Windows File Explorer the TIFFs are there.

I thought I might need to separately import the TIFFs but LR can’t see any in the Import dialog.

What am I doing wrong, please? TIA

OS and LR Classic all latest versions. I think NLP is too but not sure where to find version number.

NLP writes tiffs as a stacked copy or in a subfolder.
Bildschirmfoto 2020-09-23 um 10.30.12

Stacked items can be identified by two vertical lines. Click on the lines to expand the stack.
Bildschirmfoto 2020-09-23 um 10.32.40

Does this solve your issue?