Using High-Sierra with the latest version of TotalFinder.
If you drag a window from the bottom, the Finder window contents rips off of the TotalFinder window frame and is independently dragable.
I’ve recorded a video and will look into how to upload it.
Attempting to upload a 4.1MB .mp4 video produces the following error: “Sorry, the file you are trying to upload is not authorized (authorized extensions: jpg, jpeg, png, gif).” The same video is 66MB as a GIF.