difference betweem thumb and image

What is the difference between a thumb of an image and the image? If I copy and paste a video or photo from my mac Photos to an external hard drive, I only get "thumb" of it, although I can see the image. Will I be able to edit this as usual? Thanks for any help.

MacBook Air (13-inch, Early 2014), OS X Yosemite (10.10.5)

Posted on Dec 21, 2015 10:05 AM

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difference betweem thumb and image

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