For security, Rakuten Drive tracks the devices used to access your account. Check the device list in Security Settings on a regular basis for any suspicious devices.
New devices are added when somebody (presumably you) signs in to your account from a new device. You can get a notification when a new device is added. See a notification by tapping the bell icon in the top right corner of the website.
Do any of the following if it's not you:
● Remove a device to click [Remove] button of each device on the list. Once removed, you will be signed out of the device immediately.
● Reset your password immediately if you think the device is unauthorized. You will need to sign in with the device again to reauthorize the device.