Steps to reproduce

Use a multistep form with different fields (such as text input, checkboxes and file upload) and enter any data. 

Expected results

The data entered should be displayed at the end of the multistep form for the User to check the data. 

Actual results

When you use multiple steps with the form module, all the data that was entered in the first steps is not shown at the end. So basically all data entered in the form is lost. 

Workaround

There is no workaround known.

Development notes