PHOTOS cannot find originals
iMac running Seqouia 15.1.1, 3.6 GHz 8-Core Intel Core i9, 1.82 TB available of 2 TB.
I have read many answers on this subject but I have no technical expertise. The answers don't seem to make sense or fix the issue. I keep my Mac updated. I have not deliberately changed any settings in PHOTOS. It has always just worked. This past year there have been frequent issues when air dropping photos from my iPhone or downloading from an SD card. I 'see' the photos but if I try to share them, I get the message originals cannot be located. Today when downloading an SD card, they did not automatically land in Photos where I usually delete from the SD card after uploading. It appears I am losing access to an increasing number of photos. In layman's terms, how does one fix this issue?
iMac 27″, macOS 15.1