Difference between 'modify' and 'edit' buttons

1. What's the difference between modify and edit?
2. Where is the Edit button located?

What's the difference between modify and edit?

Specifically a "modification" is any change. An "edit" is correction, revision, or preparation for publication. To give an example of the difference in your specific example, many files are produced as a result of an automated process.

Where is the Edit button located?

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