Here's a tutorial video on how to fix the r6 rig to animate in blender using the blender rig roblox studio plugin and the blender add on file. I hope this has helped many people who have had this problem. After doing research and contacting the creator of the roblox studio blender rig export and import plugin, I have finally found out how to fix it in the most simplest way, enjoy!

Roblox Plugin https://www.roblox.com/library/716953...
Blender AddOn https://pastebin.com/raw/V5aBemWL

My Roblox https://www.roblox.com/users/84678496...
My Twitter   / xjusxvi