I have Lightroom 6, Sony A99ii, and Sony A77. I got a new computer with Windows 10. I've installed all my files, and the LR Program. Program opened fine, catalog is there, presets are all there. I've also installed the Sony Raw file reader so I can preview my images in File Explorer. When I go to import photos in LR, some of the images say Preview unavailable for this file while other's are showing. There's no ryhme or reason to which camera because it's mixed with both camera's. What I mean it's showing thumbnails for some of the A99ii and some not, same with A77. Attached is a screen shot. Am I missing a setting somewhere?