Insert images
You can insert images to your outline by drag-and-drop them to your outline or using the File Picker from Main Menu > Edit > Insert > Image (⇧⌘I).
When you first add an image to your outline, Outlinely prompts you to convert your outline to Rich Outline format, which supports image attachments. Similar to an RTFD package, a Rich Outline document is basically a folder contains the main outline file and image files.
You can choose Convert to allow the image to be inserted.