[Q] Moto G 4G SD card to PC photos topic

I have a Moto g 4G and have always set standard camera app to save photos to SD card which then show on phone gallery. problem is up until about 2 months ago when i plugged phone into PC via USB it would show all my photos, yet now it only shows photos up until 2 months ago. All of the photos show if I remove the SD card and plug directly into the PC. the photos show as being stored on the SD card in the DCMI folder.
Why then are the newer photos not showing on PC via USb lead but showing on phone gallery on phone and showing when i plug SD card direct into PC.

Thanks in advance

Dave