SpeedTree not letting me use a custom mesh for my leaves

Stu2Prof

I'm trying to use a simple leaf model on some Ivy vines in Speedtree but when I import the model I just get a red X in the model previewer and if I drag the model into the main viewport nothing happens. Any advice on what I might be doing wrong? Its a very low poly count and not sure what I'm doing wrong

Stu2Prof

Switched to Obj format and its started working. All good!