To upload files to your listings faster, you can use the ZIP file function on your computer (right click a folder and you will see "compress" as an option, this will make a ZIP file from all the files in that folder) to compress the files into one ZIPPED file.
You can then upload the zipped file into the file manager where it will unpack all the files for you, this saves a lot of time when you are dealing with many pictures at the same time.
Here is a screencast that shows you how to use the advanced file manager.

