Good Evening. My site, running Concrete 9.4.3 under PHP 8.3.23, has a page for files that visitors might like to download. For that I have used a file block and that seems to work fine except that where I have been expecting a thumbnail picture of the first page of the file I get a standard PDF icon. The thumbnails appear if I look at the folder from which the files are drawn in File Manager so they do exist. I presume that there is tick box somewhere that I have filed to find. I had thought that setting the icon size too small would be the problem but changing that does nothing.
My apologies for raising sucha trivial question, but it is something that annoys, mainly because I cannot find the right parameter to tick.