If I use Android file transfer to attempt to transfer my pictures from my DCIM folder on my mobile to my MacBook pro it fails with a msg "Cant access storage device"
I can successfully access other smaller folders so I suspect it is something to do with the folder size of DCIM/Camera.
I have 128Gb of storage on my phone.
Thankyou for all your suggestions but I've solve the problem myself by simply circumventing it. There is clearly a bug in the use of the Android file transfer app method which prevents anyone from opening a folder with more than 3-4K of photos. A limitation which ought to be publicised. Something which I find incredible. However the solution for me was to simply delete 2k worth of photos ( which fortunately) were already on my MacBook connected storage drive. The folder then opened as expected and I copied the remains files across.
Lesson is copy files across on a regular basis say once a year and delete them.
Thanks again for your suggestions.