Substance Files not Working

If I drag a Substance into an ASE shader graph, I get a message that it is converted, and a blank graph called Standard is opened, but nothing else, except this info:
Convertion complete. Old data will be lost when saving it
UnityEngine.Debug:Log(Object)
AmplifyShaderEditor.AmplifyShaderEditorWindow:ShowMessageImmediately(String, MessageSeverity) (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/AmplifyShaderEditorWindow.cs:3901)
AmplifyShaderEditor.AmplifyShaderEditorWindow:ShowMessage(String, MessageSeverity, Boolean) (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/AmplifyShaderEditorWindow.cs:3885)
AmplifyShaderEditor.UIUtils:ShowMessage(String, MessageSeverity, Boolean) (at Assets/AmplifyShaderEditor/Plugins/Editor/Utils/UIUtils.cs:2140)
AmplifyShaderEditor.AmplifyShaderEditorWindow:ConvertShaderToASE(Shader) (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/AmplifyShaderEditorWindow.cs:392)
AmplifyShaderEditor.AmplifyShaderEditorWindow:OnValidObjectsDropped(Object[]) (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/AmplifyShaderEditorWindow.cs:2423)
AmplifyShaderEditor.DragAndDropTool:TestDragAndDrop(Rect) (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/DragAndDropTool.cs:39)
AmplifyShaderEditor.AmplifyShaderEditorWindow:HandleGUIEvents() (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/AmplifyShaderEditorWindow.cs:2743)
AmplifyShaderEditor.AmplifyShaderEditorWindow:OnGUI() (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/AmplifyShaderEditorWindow.cs:4293)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)
I have not tried this before, but it seems like this is not the expected behaviour. Can you help please?
Using Unity 2018.1.0f2 with ASE 1.5.3 dev01.
Convertion complete. Old data will be lost when saving it
UnityEngine.Debug:Log(Object)
AmplifyShaderEditor.AmplifyShaderEditorWindow:ShowMessageImmediately(String, MessageSeverity) (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/AmplifyShaderEditorWindow.cs:3901)
AmplifyShaderEditor.AmplifyShaderEditorWindow:ShowMessage(String, MessageSeverity, Boolean) (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/AmplifyShaderEditorWindow.cs:3885)
AmplifyShaderEditor.UIUtils:ShowMessage(String, MessageSeverity, Boolean) (at Assets/AmplifyShaderEditor/Plugins/Editor/Utils/UIUtils.cs:2140)
AmplifyShaderEditor.AmplifyShaderEditorWindow:ConvertShaderToASE(Shader) (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/AmplifyShaderEditorWindow.cs:392)
AmplifyShaderEditor.AmplifyShaderEditorWindow:OnValidObjectsDropped(Object[]) (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/AmplifyShaderEditorWindow.cs:2423)
AmplifyShaderEditor.DragAndDropTool:TestDragAndDrop(Rect) (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/DragAndDropTool.cs:39)
AmplifyShaderEditor.AmplifyShaderEditorWindow:HandleGUIEvents() (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/AmplifyShaderEditorWindow.cs:2743)
AmplifyShaderEditor.AmplifyShaderEditorWindow:OnGUI() (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/AmplifyShaderEditorWindow.cs:4293)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)
I have not tried this before, but it seems like this is not the expected behaviour. Can you help please?
Using Unity 2018.1.0f2 with ASE 1.5.3 dev01.