We'll create fresh WordPress site with Contact Form 7 Dropbox installed. You have 20 minutes to test the plugin after that site we'll be deleted.
Add-on plugin for Contact Form 7 – adds the option to upload file directly on dropbox.
NOTE: This plugin requires Contact Form 7 version 4.8 or later.
Simply go to your form settings, choose the “Dropbox Settings” tab and set the Dropbox access token, file input ID and dropbox folder name.