modify "file upload by user" php script

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
I have and script ready that admin user can uplodad files from pc to the sever script folder, admin select the user and the file from Pc. Then in privado.php the user can see only your files. Now this script dont work and also I need add new features.

- Add messsage comment to he file. User will see this description text when download the file.
- Add categories for the files, only 3 categories. Then user can see the 3 categories and download the files

If you enter in:
user: admin
password: admin

Select "Añadir ficheros" for add files, and añadir usuarios for add user you can see how works

I attach the script files

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