I am fairly new to the use of rigging in Blender. I created this small robot to which I applied a pose and armature, however when exporting to FBX something seems to happen to the proportions (the end goal would be to import it to Unreal Engine), the mesh warps, showing only the legs of the robot, trying to export just the mesh, no problem occurred so I assume the error is within the armature, does anyone have any ideas?
Thanks in advance! 
Welcome 
…
…for combined objects the usual question would be:
Did you applied scale?
Objects can be added and scaled differently in Object mode… for sketching purposes… if combined to a more complex structure this could lead to problems … best to apply the scale for every object (or only adding in edit mode in th efirst place)
Where are the feed in the second image (or what are you tryin to show there)?
Scale is 1.0, 1.0 , 1.0 and you reassigned the armature ?
When you talk about the Scale that is 1.0, 1.0 , 1.0, you mean that the size of individual objects must be of that size? The armature modifier was not applied to the meshes because it seems that once applied, they no longer follow the path of the bones.
I am really a beginner on this, forgive me if I don’t understand some concepts
In Object mode… scale… :
Which you can do by pressing Ctrl A and choosing Scale
Oh yes, I got it, I think I got everything to scale 1.0, 1.0, 1.0, however I wonder if the bones will position correctly once exported
EDIT: anyway, a couple of days ago I tried to export the mesh without the armature and actually the proportions were correct
You need to Ctrl A > Scale both the object and the armature
Everything seems to be okay, theoretically now, when it is exported, the leg positions and their size should be in place as well as the bones?