Dear @BurningTreeC, just to let you know that there seems to be an incompatibility between TiddlyFlex and the various Preview plugins built on top of Tobibeer’s one. I did try the modified version suggested in this thread and @Mohammad’s Quick View as well but both of them didn’t work. It may be that @BurningTreeC’s TiddlyFlex does something that prevents previews (CSS class tc-popup-keep) to be displayed, maybe in that tiddler: $:/plugins/BTC/TiddlyFlex/globals/layout/templates but I am not proficient enough to deal with this by myself.
I would be grateful if your could have a look at it.