But if I import existing projects into the workspace in eclipse, will it only copy the contents of the project at this time?
A project in eclipse is not just a copy of a project. Strictly speaking, an eclipse will make references to the dir project.
So, when I make new changes to the project, will the files automatically update in eclipse?
If the project has changed beyond the eclipse, they will be automatically updated. But you need to update the project in eclipse. Before updating the project, the eclipse will display a message.
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