Hello mazzam! When I upload an image to a gallery and there aren't any words that match the keyword I want to use, I just type it in and hit the comma key to register it as a keyword and the website saves the keyword for that image and when I want to use that keyword again for another image, the website has that keyword saved permanently amongst the other keywords for me or anyone else to use. Have you tried manually typing the keyword in and seeing if it shows up in the keyword section for other images you upload? The website should have saved that keyword.