there is ANY WAY to upload a file to a unity web project?

I need to upload a texture/audio-file from a local disk to a unity web project, from the same project.
I was looking lot to do this and I still don´t have an idea if this is someway possible. If someone have and idea… it will save my life.

Your Unity Web project should be able to download anything from the same folder or a sub-folder of the one where it’s hosted from on your server using WWW and use it within the app.

Thank you, I did n´t know this until now, again thanks!!