Add the functionality to import Gltf and Glb files

Assets/_Functionalities/GltfImporter/Scripts/GltfImportAdapter.cs

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+using System.IO;
+using Netherlands3D.Twin.Layers.Properties;
+using Netherlands3D.Twin.Projects;
+using UnityEngine;
+
+namespace Netherlands3D.Twin.Functionalities.GltfImporter
+{
+    [CreateAssetMenu(menuName = "Netherlands3D/Adapters/GltfImportAdapter", fileName = "GltfImportAdapter", order = 0)]
+    public class GltfImportAdapter : ScriptableObject, IDataTypeAdapter
+    {
+        [SerializeField] private GltfSpawner layerPrefab;
+
+        public bool Supports(LocalFile localFile)
+        {
+            return localFile.LocalFilePath.EndsWith(".glb") 
+                || localFile.LocalFilePath.EndsWith(".gltf");
+        }
+
+        public void Execute(LocalFile localFile)
+        {
+            var fullPath = localFile.LocalFilePath;
+            var fileName = Path.GetFileName(fullPath);
+            GltfSpawner newLayer = Instantiate(layerPrefab);
+            newLayer.gameObject.name = fileName;
+
+            var propertyData = newLayer.PropertyData as GltfPropertyData;
+            propertyData.Uri = AssetUriFactory.CreateProjectAssetUri(fullPath);
+        }
+    }
+}

Assets/_Functionalities/GltfImporter/Scripts/GltfPropertyData.cs

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+using System.Collections;
+using System;
+using System.Collections.Generic;
+using System.Runtime.Serialization;
+using Netherlands3D.Twin.Layers;
+using Netherlands3D.Twin.Layers.Properties;
+using Newtonsoft.Json;
+using UnityEngine.Events;
+
+namespace Netherlands3D.Twin.Functionalities.GltfImporter
+{
+    [DataContract(Namespace = "https://netherlands3d.eu/schemas/projects/layers/properties", Name = "Gltf")]
+    public class GltfPropertyData : LayerPropertyData, ILayerPropertyDataWithAssets
+    {
+        [DataMember] private Uri uri;
+
+        [JsonIgnore] public readonly UnityEvent<Uri> OnUriChanged = new();
+
+        [JsonIgnore]
+        public Uri Uri
+        {
+            get => uri;
+            set
+            {
+                uri = value;
+                OnUriChanged.Invoke(value);
+            }
+        }
+
+        public IEnumerable<LayerAsset> GetAssets()
+        {
+            return new List<LayerAsset>
+            {
+                new (this, uri)
+            };
+        }
+    }
+}