Add multiple local repos at once

[Miguel Rodo]

Within a given folder, there are multiple folders each containing Git repos. Is there a way I can add all of them at once? If so, how? 

On StackOverflow, this question (https://stackoverflow.com/questions/55928316/how-to-add-multiple-local-repositories-at-once-into-sourcetree-windows-version) asks exactly the same thing, but the advice (of selecting the folders and dragging into the Local repositories section on a new tab; i.e. from left to right in the attached pic) doesn't work for me.