Hi,
Check out the file will not create a copy. By checking out a file, a user can prevent others from editing that file. If user wants to make changes to a file on a site and he wants to make sure no one else can edit it, check out the file.
Information about checking out/in:
Check out, check in, or discard changes to files in a library
Top questions about check out, check in, and versions
Best regards,
Linda
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