Finder not copying all files from camera

rodopa

Registered
Recently I noticed that finder is not copying all files from my Sony H50 camera to my external hard drive.

The camera opens as Untitled in the finder window (source) and I usually open another Finder window, opened to my destination directory.
I'll then select all the files I want to transfer from the source,and drag them to the other Finder window.
However, Finder will arbitrarily copy less than my selection.
Even at 20 files, Finder only copied 17 files to the destination directory.

Occasionally I'll receive a message that a file already exists. When that occurs Finder will delete all files processed to that point from the destination directory.
There are times when I've transferred over 500 files at a time.
I wonder how many photos / files I've lost during the past year!
 
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