Fbx Animation And Skeletal Issues

Hello there, I am new to buildbox and I just wanted to try out this software to see if I can reduce the time I spend programming on designing simple concepts or making mobile games. The new support for the FBX format got me interested and I watched tutorials and used the demo model provided in the official tutorial but when I tried using my models with custom rigs the animations are always broken but the models import just fine in other software. I want to know if there is something I am doing wrong or if its an issue that needs fixing.