Some time back, I inquired about the best meta-data editor. In the end, I chose XnView Classic. A long time has elapsed while I pedantically absorbed the fundamentals of captions, keywords, etc., ad nauseam.
Anyhow, I'm putting up this pic to personally check that all my IPTC/XMP edits got in:
Feel free to look if you have an on-line EXIF viewer such as a browser add-on.