My company recently upgraded my iMac to one with the [REMOVED AS PER COMMUNITY GUIDELINES] Sur OS (v11.2.3) and none of the images in my Camera Uploads folder, for example, are showing thumbnail pics, only generic icons for JPGs.
However, if I open up an image and close it, then a thumbnail picture shows. I can't open and close the hundreds of images I have on Dropbox, so is there something quicker I can do to solve that problem?