Currently, there is no direct way to achieve this. However, you can use a workaround to accomplish the same outcome.
You can send an upload reminder to yourself. This will send you a link, which you can open on the new device.
The link can only be used once.
Steps
Click the "More" button on navigation menu at the bottom right
Select "Reminder" from the new menu - at the bottom
Enter your email address in the input box, select "Send now", and hit the "Send" button
You will receive an email a few seconds later with a link. Open the link on the device you want to access your guest session/account.
NOTE: The link can ONLY be used once. You'll need to send another link for another device.