turns out this one is better.
https://fredfred.net/skriker/index.php/iimage-browser
& i found that in wordpress/options/miscellaneous the recommended directories wont work due to permissions, & if you 766 the permissions on the /wp-content/ directory, then the image browser button wont appear! catch 22! i’d assume its because the plugins directory lives in the wp-content directory, & likes its permissions left as -is for some reason?
so, after much farting about, i found i had to puta “gallery” directory OUTSIDE the entire blog directory (root of my site) to get it to work.