Manually Adding Thumbnails to Templates
If you import Templates that contains Control Layers, unlike Levels, it does not take a snapshot of Unreal Engine. Users need to manually create custom thumbnails for Templates with Control Layers.
To do this, we need to store it in the folder as structured below. by doing this, we override the default thumbnails generated by Unreal Engine.
├── ProjectFolder
│ ├── Thumbnails
│ │ ├── Level1.png
│ │ ├── Level1
│ │ │ ├── Layer1.png
│ │ │ ├── Layer2.png
│ │ ├── Level2.png
│ │ ├── Level 2
│ │ │ ├── Layer1.png
│ │ │ ├── Layer2.png