Blender import / glass mat problems - missing details

Hi,

Please help me figure out what is wrong. Note: I’m a noob in both Blender and UE.

So, I’ve already imported a few models earlier successfully, but now my robot and others got problems.

It looks okay, until I set up all materials.

After setting a glass material (other material looks ok):

Also an other shape I’ve imported is visible in Asset browser and in the Asset window (?or what is its name?), but I don’t see it at all in the game world if I drag it in. I’ve tried to scale it up-down.

Here are my Blender export settings:

and the UE import settings: