How can I put keyword in esp.file? ( error: you cannot put or modify xmp meta data )

[youngcha.kim]

Hello.

I tried to put keywords in my esp.file but there is an error saying " you cannot put or modify xmp meta data".

It happens most of my esp.files but sometimes there are esp.files that I could put keywords.

And other files like jpg, png and ai was ok.

Best regards and have a nice sunday!

[Lumigraphics]

What is an esp.file?