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+How do I change or add S3 credentials, when a S3 special remote is already initialised/enabled?
+
+I have a repository with a `public=yes` S3 remote, such that people can read the data without credentials.
+But then when they need to upload files, how do they add their credentials?
+
+Setting the `AWS_*` environment variables when running `git annex copy --to=s3` works, but then the credentials are not stored.