EdgeCAM does not do true backplotting. The verify in EdgeCAM works off of the tool paths generated inside of EdgeCAM. EdgeCAM does not make the G-code first and then calculate the animation. The same holds true for MasterCAM. There are programs out there that will do what you are asking though. If you want a full 3D animation, you will probably have to pay. If you just want to see the tool paths, there are some freeware/shareware programs that will do it.