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Run default component with official ej2-ftp-aspcore-file-provider (https://github.com/SyncfusionExamples/ej2-ftp-aspcore-file-provider) is giving a NullPointerException somewhere on your end.
Same issue with ej2-ftp-aspcore-file-provider (and maybe others as well).
The file manager is completely unusable therefore and can't be fixed at this moment!
[2021-07-16T08:19:58.086Z] Error: System.NullReferenceException: Object reference not set to an instance of an object. at Syncfusion.Blazor.FileManager.SfFileManager`1.PerformOperation(String item, Boolean isViewChanged) in Syncfusion.Blazor.dll:token 0x600cfe0+0x68b at Syncfusion.Blazor.FileManager.Internal.FileManagerContextMenu`1.OnItemSelect(MenuEventArgs`1 args) in Syncfusion.Blazor.dll:token 0x600d223+0x3d1 at Microsoft.AspNetCore.Components.ComponentBase.CallStateHasChangedOnAsyncCompletion(Task task) in Microsoft.AspNetCore.Components.dll:token 0x60000a2+0x65 at Syncfusion.Blazor.Internal.SfBaseUtils.InvokeEvent[T](Object eventFn, T eventArgs) in Syncfusion.Blazor.dll:token 0x6013f7d+0xb2 at Syncfusion.Blazor.Navigations.Internal.SfMenuBase`1.ClickHandler[T](List`1 menuItems, T item, EventArgs e, Boolean isEnterKey, Boolean isUl, Boolean header, Boolean hamburgerMode) in Syncfusion.Blazor.dll:token 0x6007445+0x204 at Syncfusion.Blazor.Navigations.SfContextMenu`1.ItemClickHandler(TValue item, MouseEventArgs e, Boolean isEnterKey, Boolean isUl, Boolean header) in Syncfusion.Blazor.dll:token 0x6006dcf+0x87 at Syncfusion.Blazor.Navigations.SfContextMenu`1.<>c__DisplayClass59_2.d.MoveNext() in Syncfusion.Blazor.dll:token 0x601788b+0x80 --- End of stack trace from previous location --- at Microsoft.AspNetCore.Components.ComponentBase.CallStateHasChangedOnAsyncCompletion(Task task) in Microsoft.AspNetCore.Components.dll:token 0x60000a2+0x65 at Microsoft.AspNetCore.Components.RenderTree.Renderer.