Adding an asset preview to a custom metadata editor
How to add an asset preview to a custom metadata editor.
Adding an asset preview
To add an asset preview to the custom editor, first choose Editor Items in the list of elements in the left part of the window.
Then click on the drop down list below (the one that usually says Show all items). Then choose Other graphical items in the list.
Now the list of available items contains a File preview that you can drag into your layout and place and size as you prefer.