If a metadata key was manually added and has no values yet, it is possible to modify its name.
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Select the Edit icon at the right end of the line of the metadata key to modify.
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Modify the name of the key.
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Select the check mark to validate the modification or the X mark to cancel.
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Select Save.
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Select Reprocess to apply the new configuration.
Once content is uploaded with this metadata key, the pencil icon disappears and it is not possible to make further modifications.