Media bay problems

I looked at quite a few posts on this, it’s not that easy to work out! In my Cubase 9.5 setup the media bay the preview works in the folders with original Cubase loops etc, but if I use file browser to look for a loop there is no previewer available, is that correct? If I add a browsed folder to my favourites then I can preview it in favourites. It seems illogical that I can’t preview in the browse folder, have I got a problem with my Cubase installation or is this how it’s supposed to be ?
Thanks for any help