Mesh faces becoming transparent when inserted into studio

So I have been on blender creating a bark mesh for a low poly tree, and the faces become transparent when put into roblox studio.

Heres an example of what is wrong;
https://gyazo.com/91e166cd474953d4f40db64d99f9da78

https://gyazo.com/092f295822a7629886787df520c1532d

https://gyazo.com/aaf43bd43ae68c30e6ce3f231f40a63a

I have flipped the faces, filled the normals but it just doesnt want to get to work.

I am currently on blender v2.79 as I prefer that layout.

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This has been asked many times before.

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