Issue with model when exporting from blender to ue4

the character thigh looks good in blender, but when exported to unreal in the same pose it looks different. A screenshot of the character in unreal and blender are linked. How do I fix this issue.

I found out. The Armature option “Preserve Volume” was checked in blender, which unreal ignores.

Check the scale of the mesh and the armature. It should be 1,1,1. If not, apply scale (Ctrl+A => Scale) and reimport.