Download: quick_upload_plugin-1.0.0.zip
Downloading: quick_upload_plugin-1.0.0.zip Quick Upload
By default it uploads files in blog's media folder (if you create or edit post in Blog B all files get uploaded to /media/blogs/b or whatever is set as default media dir for this blog ).
You can also enable a directories select tree in plugin settings and choose a directory before uploading files.