CameraFTP can offer cloud storage to DashCams. You need to make sure that your DashCam can upload footage to CameraFTP cloud via FTP/FTPS/SFTP or SMTP, and your DashCam is connected to the Internet. Currently we don't have a special service plan for DashCams, so your DashCam will be treated as a regular IP camera. If your usage is very low, you can order a low level (motion-recording) plan.
You might be able to use CameraFTP Mobile Security Camera App (for iOS/Android) as DashCam. Otherwise, you can use a DashCam or regular IP camera connecting to your mobile hotspot or mobile access point.