"Some import operations were not performed" "An unknown error occurred"
When I try to import files, by adding to an existing catalog, from an external hard drive, I get a pop up box titled: "Some import operations were not performed". In the error report it says "An unknown error occurred (170)". I assume the "170" refers to the number of images that are affected not an error code. This problem only affects some images as others have been successfully imported. I have checked permissions, as recommended in other posts, even though there isn't a "destination" file when adding images to a catalog. I did upgrade my computer and operating systems in the last two months, and the problems may have begun around that time. What am I missing?
Catalina, 10.15.7
Lightroom CC, 10.1
