Couchdrop understands that not everyone is technically savvy and due to this, using the likes of SFTP or other clients can cause headaches, when all you want is for files to get to where you want them. To make life easier, Couchdrop has developed "drop" which allows anyone to upload files to your Couchdrop hosted storage simply using a browser file upload portal.
The URL to be used for this service is https://upload.couchdrop.io
To use this service, create a new user under https://my.couchdrop.io/manage/users
Have your external user head to upload.couchdrop.io, enter their provided user credentials then they simply drop their file in area provided and start the upload.
All going well the below message should be presented to show that all has gone through.
Note we are currently looking to update this in the near future so that you can provide an external user a URL and not need to provide credentials so that they can upload directly to a URL rather than having to work through credentials too.