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FastRawViewer doesn't change metadata for raw files, and only very limited changes are available for JPEGs (ratings, labels).

You can edit metadata with ExifTool https://exiftool.org or maybe using one of the GUI wrappers built around it. Many are listed at https://exiftool.org/#links under 'Related Utilities'.

Please make sure you are not re-writing the original files, especially when doing tests.

The place to seek help with ExifTool is https://exiftool.org/forum/index.php