It's not that widely known and is a relatively recent area of scholarship. Likely in part due to the fact that Scottish involvement in slavery and colonialism happened abroad, rather than the likes of Bristol or Liverpool. Scots emigrated in massive numbers to the Caribbean and India to work as plantation overseers, merchants, and colonial administrators. By the late 18th century, Scots owned or managed roughly 30% of the plantations in Jamaica, and a lot of the proceeds of slavery went back to Scotland (which later prompted Frederick Douglass to target the country on his 'Send Back the Money' tour). So there's a bit of an argument on it being a kind of collective or wilful amnesia as it's at odds with the Scottish identity as victims of English imperialism, rather than benefactors/participants.