Have anyone developed file manager similar to picture below? If not, can you guide me how to achieve? Should I create a new app or doctype or page with treeview?
Sorry, not an answer to your question. What tool did you use to make that graphic?
My colleague sent to me, he might get it from here (Erpnext forum).
Its made using this https://balsamiq.com/
Was able to make the treeview, but not the one you have on the right. This is a good feature to have!