How to bulk ADD new keywords to images in Sharepoint Asset Library app - WITHOUT overwriting existing keywords?

[Microsoft Windows]

I'm adding keywords to images in our Sharepoint Asset Library app. I do this by selecting all images within a folder, then adding keywords. This successfully adds the keywords to each image in one go.BUT: when I then select a subsection of images in the same folder to add additional keywords, it OVERWRITES the existing ones I just added. This makes the bulk keyword editing fairly useless.Is there a way I can add ADDITIONAL keywords to 2 or more image files, without the original keywords getting overwritten?

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