diff --git a/src/entities/copy.ts b/src/entities/copy.ts
index 7dcf061..a1f77ab 100644
--- a/src/entities/copy.ts
+++ b/src/entities/copy.ts
@@ -226,13 +226,22 @@ function copyEntities(entities: Entity[]) {
         legacy_scripts: api.hasLegacyScripts,
         hierarchy: {},
         assets: {},
-        type: 'entity'
+        type: 'entity',
+        value: entities.length === 1 ? null : []
     };
 
     // build index
     const selection: Record<string, Entity> = {};
     for (let i = 0; i < entities.length; i++) {
-        selection[entities[i].get('resource_id')] = entities[i];
+        const resourceId = entities[i].get('resource_id');
+
+        selection[resourceId] = entities[i];
+
+        if (entities.length > 1) {
+            data.value.push(resourceId);
+        } else {
+            data.value = resourceId;
+        }
     }
 
     sortEntities(entities);
diff --git a/test/api/test-entities.js b/test/api/test-entities.js
index a97808e..3731d25 100644
--- a/test/api/test-entities.js
+++ b/test/api/test-entities.js
@@ -1233,7 +1233,8 @@ describe('api.Entities tests', function () {
                 [e.get('resource_id')]: e.json()
             },
             assets: {},
-            type: 'entity'
+            type: 'entity',
+            value: e.get('resource_id')
         }));
     });
 
@@ -1259,7 +1260,8 @@ describe('api.Entities tests', function () {
                 [e2.get('resource_id')]: e2Json
             },
             assets: {},
-            type: 'entity'
+            type: 'entity',
+            value: [e.get('resource_id'), e2.get('resource_id')]
         }));
     });
 
@@ -1285,7 +1287,8 @@ describe('api.Entities tests', function () {
                 [e2.get('resource_id')]: e2Json
             },
             assets: {},
-            type: 'entity'
+            type: 'entity',
+            value: [e.get('resource_id'), e2.get('resource_id')]
         }));
     });
 
@@ -1345,7 +1348,8 @@ describe('api.Entities tests', function () {
                     type: assets[3].get('type')
                 }
             },
-            type: 'entity'
+            type: 'entity',
+            value: [e.get('resource_id'), e2.get('resource_id')]
         }));
     });
 
@@ -1397,7 +1401,8 @@ describe('api.Entities tests', function () {
                 [e.get('resource_id')]: e.json()
             },
             assets: {},
-            type: 'entity'
+            type: 'entity',
+            value: e.get('resource_id')
         };
 
         for (let i = 0; i < assets.length; i++) {
@@ -1451,7 +1456,8 @@ describe('api.Entities tests', function () {
                 [e.get('resource_id')]: e.json()
             },
             assets: {},
-            type: 'entity'
+            type: 'entity',
+            value: e.get('resource_id')
         };
 
         for (let i = 0; i < assets.length; i++) {