There’s a compatibility issue with the Premio - Folders Pro v3.2.9 plugin. The following console error occurs:
TypeError: l(“#folders-folderstree”).folderstree is not a function. (In ‘l(“#folders-folderstree”).folderstree(!0)’, ‘l(“#folders-folderstree”).folderstree’ is undefined)
i (media-folders.js:2:41484)
(anonymous function) (media-folders.js:2:48790)
dispatch (load-scripts.php:2:40041)
Removing the lines for deregistering and dequeueing the folders-tree script in class.wpdatafolders.php seems to resolve the issue.