Hi @Umar_Yaseen ,
Thanks for your post.
For your question regarding glTF conversion behavior, here is an example of loading a glTF from Cesium ion as a primitive instead of as an entity. Cesium Sandcastle
Regarding viewing metadata carried over from your original FBX file, this previous threads details the steps for basic metadata viewing How to make a properties box
Please let us know if these resources are helpful or if you have further questions.
Best,
Luke