I've been "wild" testing the behaviour of the module and I've noticed a major issue with the location field and/or the file field.
One of the steps on my form is dedicated to the location, another is dedicated to the upload of pictures (also using a focus module). The location field is required.

First time, everything is saved correctly. But when I go to step 3 and save, go to step 4, then step 2 and save etc, sometimes, the content is lost...

I will try to know where dit comes from and update this issue.

Does anybody have the same kind of issue ?