Is it normal that when I open a folder full of images on my nextcloud server, that there are no thumbnails for any of the images, until I open each one? 
Without the thumbnails I don’t know which photo I want to look at 
Hi Lara. As I understand it thumbnails schould be (slowly) created once you open a folder with pictures. That might take a moment though.
There is an preview generator in the nextcloud appstore. With that you can schedule a job to create thumbnails in advance.
If you alsways have to press a fullsize picture first to see any thumbnails then something might in fact be slightly off in your set-up.
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I tried on a Linux server and it works better 