Good morning,
I would like to change the image that appears by default when you put a document in thumbnail format on a SharePoint document library web part but there does not seem to be any possibility directly in the options of the web part.
I also tried to create a thumbnail image column (see image below) and put it in images or URL but it doesn’t seem to work either.
Please contact me if anyone has ever had this problem or if you have an answer to this problem.