Yummy FTP Alias is described as 'brings quick and easy drag & drop FTP to your Desktop - drag your files onto an FTP Alias icon in the Finder or Dock to upload them to your FTP/S + SFTP + WebDAV/S server!' and is an app in the File Sharing category. There are three alternatives to Yummy FTP Alias for Mac. The best alternative is Dropzone. It's not free, so if you're looking for a free alternative, you could try FileShuttle or Liszt.
Liszt is a simple that lives in your menu bar. When you drop an image on it, it uploads the image to your FTP server. The link to the image is copied to your pasteboard as a Markdown image tag. This saves you a lot of hassle when adding images.