I am trying to make drop an asset clickable

By clickable you mean, make the placeholder icon to be clickable or you need options like browse,clear and pick?

For the former one, I am afraid that is not feasible with the existing resourceType - you might need to overwrite the css for it and write some necessary actions for the post click events.

For the latter part, make sure that you are using all necessary resourceType properties. 

if you would like to see the all available properties of the file upload resourceType, check here /libs/cq/gui/components/authoring/dialog/fileupload/render.jsp.

Note: Please do not edit or delete any files under libs.