Cannot import brushes into my Creative Cloud Library using Chromebook

[GreyAngel]

Basically, I'm unable to move brush sets from my downloads to a creative cloud library. I've tried moving them into my CC files first, didn't work. I tried to use the website version, didn't work. I've also tried dragging the file from my downloads and into the library but nothing. The plus button in the library just lets me add pictures or take photos. Is there anything else I can try?