This is the first release of the WP-Files plugin for WordPress. Please test it out any bugs you have comment on here. It allows you to attach files to your posts. Go to the write post page and see the bottom.
Although I had to actually look at the code to figure out what it does. You may want to write up a description for it.
Also, your function names and variables should use a prefix that identify them as unique. It will prevent them from clashing with other plugins and causing unexpected damage. perhaps adding j20_ to the function and global variable names. Refer to the Codex coding standards and developer docs.