We've sent you the steps on how to recover the data via a previous e-mail you sent us, but we wanted to place to steps in here incase any future users need them as well.
It is possible to retrieve the data, but it cannot be done directly as the HTML in the file cannot be placed directly onto a design since it is generated as a text component.
The workaround requires you to install ProtoShare for Google Drive, which is a free standalone version that is compatible with Confluence, and upload the file to your drive. You can then open the HTML file with the Google Drive plugin and you will be able to edit it as a normal design. It is then possible to copy and paste the components on the design between the two versions.
Here is a direct link to the plugin: ProtoShare for Google Drive
. Once you have installed it and the file is in the drive, just right-click it and open it with ProtoShare.