A few years ago, HubSpot introduced the COS Uploader as a way developers and designers could work locally with files on the Content Optimization System. During INBOUND15 we introduced a new FTP that has the same functionality of the COS Uploader, but is bi-directional and allows you to use many of your favorite FTP clients.
As a result, the COS Uploader will no longer be supported after December 31st. The COS Uploader will continue to work, but will not officially be supported. To continue using this functionality, please download an FTP client, such as Fetch, and connect to the HubSpot FTP service with these instructions.
We really appreciate all of the feedback and support of the COS Uploader, and hope you enjoy using the HubSpot FTP.