I have two link demo from Kendo FileManager.
First link: https://dojo.telerik.com/oFefoyIm
Second link: https://dojo.telerik.com/OxAWOrIF
Each link uses a different method of Kendo FileManager. But, with Second link, I can call function.
Otherwise, First link can not call.
Two image will show you my test, and And I am having a similar case in First Link in my project, it cannot call the function