SanDisk JPEG icons instead of thumbnail images
I've purchased a SanDisk Extreme Portable SSD and loaded photos on it. Under view, I clicked on icon. That only shows the file name under a JPEG icon, no thumbnail image. In addition to not seeing images, I cannot open image files from the SanDisk device using Lighroom6 or Photoshop Elements 2020. I asked SanDisk about both of these issues, its help staff replied my device was a standard external hard drive and that the problem was not with it but with my Apple iMac computer (updated to Catalina). Does anyone have any advice for me on thumbnails and PSE/LR use with the SanDisk SSD? Thank you!
iMac 21.5″, macOS 10.15