I'm Having Problems with stager and sampler

Hi, I'm having a problem with Stager and Sampler. I want to know how can I add tweak controls in sampler to be added to exported SBSAR files? right now my exported BASAR cannot be changed in Substance Painter. I have stager as well, when I export my models I can't see the export to stager selection in Substance Painter, was this added, or just not added for steam version of Sampler and Stager? Thank you