Is your camera shown, when connected, in the File Manager? if so you should have no trouble. Use it as a disk drive, go into it, select what you want to transfer to your computer, transfer it to your computer.
If that does not happen, esp. if Linux Mint prompts you to select an appropriate program to open your camera with, have you tried telling it / pointing it to, GTHUMB ? that's basic, but usually works.
(Or if not GTHUMB, then GWENVIEW, or DARKTABLE, also.)
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