Thumbnail problem

Hi, I wonder if someone can help me please because I have reached to the point where i am picking my hair out.

I have a Sony tv with Kodi installed from the Google Play Store. I have added movies using smb share from my external nas. I have organised all my movie collection in 3 category folders: English, Animation and Documentary. When i go to movies, I can see all my movies aggregated together which are showing all the thumbnails. Also on the main deck, recently added movies and in progress are showing correct thumbnails which have been generate using themoviedb scrapper.

However when I go to videos – files – english folder, all i see is blank folders, no thumbnails. similalry, going to video – files – animation does not show thumbnails. I have scanned the library using all different scrappers, deleted/reinstalled kodi/ changed the shares from smb to nfs but still I am unable to generate thumbnails in videos.

I can see thumbnails on the main deck and the from movies folder, but not in videos section. Also, i have tried adding a folder as a favourite but cannot see a thumbnail for that either.

I have added the same movies collection on my windows 10 pc using smb shares, all thumbnails show fine. I have installed mrmc on apple tv 4 using the same movie collection I can see all thumbnails. But its just that kodi on Sony tv does not show the thumbnails properly. The Kodi version is 17.1, officially installed from the play store.

Any help please?

Cheers