While you are editing the wiki, you may want to insert an image or file that is not in your channel. If the file exists already, you can add an external link. Or, if the file doesn't exist, you could exit the wiki and create the file. But AirSend increases your efficiency by enabling you to upload or create a file and save it in the channel without having to leave the wiki editor.
The left panel of the wiki editor shows the files and images that are already uploaded to the channel as well as buttons for uploading a file and creating a file or folder.
The file for the wiki, index.md, is listed with the other files in the channel. The .md extension indicates that it is a markdown file, a plain text file that may include markdown formatting.