If your session is not secure i.e. HTTP and not HTTPS, COPY AND PASTE between sessions will not function.
You will need to use this approach
At the launch of a Cameyo session, a user will be offered the ability to ALLOW or BLOCK the clipboard.
You should always select "Allow"
If you have selected "Block" which disables your Copy/Paste function, you will need to do the following to re-enable it:
1) In your Chrome browser, navigate to chrome://settings/content
2) You will notice the Blocked clipboard
3) Set the Clipboard to "Allow"