When you are working with topics in the Editor you can insert file objects using the Insert File Object from Thumbnail option.
Insert File Object from Thumbnail displays file objects in a folder as thumbnails, making it easier to locate the correct image. The General Settings option is used to configure the Folders drop-down list in the Insert File Object From Thumbnail dialog box. The folders drop-down list can be configured to include any commonly used folders within the library, so users can quickly locate folders containing the images they need.