Where I can find the uploaded files?

For each uploader in your dashboard, you find a link "in your Drive" which opens directly the relevant folder with uploaded files.

When creating a new uploader, go to "Advanced Settings" and create a Destination folder (just write the name of a new folder to the gap) OR you can choose from folders you have on your Google Drive.

In both cases - you will find the uploaded files on the selected folders on your Google Drive.