The Iptanus File Upload plugin can move what your visitors upload into cloud storage, securely and without your having to do anything by hand.
Services supported
Each link above leads to the article explaining how to set that service up.
How the transfer works
Files arrive on your own site first. The plugin then transfers them to whichever service the upload form’s shortcode names. That happens in the background, so nothing about the site slows down while it does.

Connecting to the service and transferring the files both happen entirely on the server. No authorisation information — no passwords, no tokens — is ever exposed to the front end or to the people uploading, which is what makes the arrangement secure.
There is no limit on the size of a file the plugin will transfer. It uses an asynchronous method of its own to work around the limits your web server and PHP would otherwise impose.
For more information or technical support, please contact us.
The Iptanus team

Hi I’m having trouble adjusting the style of my uploader and getting it to send files to my Google DropBox. How do i type in the path for google drive?
Hi, suppose that you have a folder Inbox inside your Dropbox account. Then you should put /Inbox in Dropbox Upload Path.
Regards
Nickolas
Buenos días, estoy intentando instalar el plugin file upload, pero me sale en siguiente mensaje: Fatal error: Cannot redeclare wordpress_file_upload_preload_check() (previously declared in /home/rotamclo/public_html/wp-content/plugins/wp-file-upload/wordpress_file_upload.php:66) in /home/rotamclo/public_html/wp-content/plugins/wordpress-file-upload-pro/wordpress_file_upload.php on line 66
Que puedo hacer, Gracias estaré atenta.
Hi, please deactivate the Free version before activating the Pro.
Regards
Nickolas
This article says that the files uploaded first get transfered to the website and then from the website to the cloud storage. I’m wondering, will the files remain in the website as well or will they be deleted once transfered to the cloud storage?
Hi, there is an option to delete the local file (the one in the website) automatically after it has been transferred to the cloud service.
Regards
Nickolas