Blender to ue4 scaling problem

I am having scaling issues with blender models, The models are becoming very small in size. Thanks in advance

Please watch this video . Hope this helps.

https://www.youtube.com/watch?v=aC1_m0VdKIY

When you export set scale to 100.

Got this amazing video. Make sure to watch this.

https://www.youtube.com/watch?v=Ayp1lof0RJU

Thanks GUPTA