diff --git a/reference/rest-api.json b/reference/rest-api.json
index a2d1ac7..22feb4a 100644
--- a/reference/rest-api.json
+++ b/reference/rest-api.json
@@ -552,51 +552,43 @@
       "AttachmentCreateRequest": {
         "type": "object",
         "required": [
-          "attachment"
+          "owners"
         ],
         "additionalProperties": false,
         "properties": {
-          "attachment": {
-            "type": "object",
-            "required": [
-              "owners"
-            ],
-            "properties": {
-              "owners": {
-                "type": "array",
-                "description": "Array of owner objects for the attachment",
-                "items": {
-                  "type": "object",
-                  "required": [
-                    "type",
-                    "id"
-                  ],
-                  "properties": {
-                    "type": {
-                      "type": "string",
-                      "description": "Type of the owner (e.g., 'record', 'form')"
-                    },
-                    "id": {
-                      "type": "string",
-                      "description": "Identifier of the owner"
-                    }
-                  }
+          "owners": {
+            "type": "array",
+            "description": "Array of owner objects for the attachment",
+            "items": {
+              "type": "object",
+              "required": [
+                "type",
+                "id"
+              ],
+              "properties": {
+                "type": {
+                  "type": "string",
+                  "description": "Type of the owner (e.g., 'record', 'form')"
+                },
+                "id": {
+                  "type": "string",
+                  "description": "Identifier of the owner"
                 }
-              },
-              "name": {
-                "type": "string",
-                "description": "Name of the attachment"
-              },
-              "file_size": {
-                "type": "integer",
-                "description": "Size of the file in bytes"
-              },
-              "metadata": {
-                "type": "object",
-                "description": "Optional metadata for the attachment",
-                "additionalProperties": true
               }
             }
+          },
+          "name": {
+            "type": "string",
+            "description": "Name of the attachment"
+          },
+          "file_size": {
+            "type": "integer",
+            "description": "Size of the file in bytes"
+          },
+          "metadata": {
+            "type": "object",
+            "description": "Optional metadata for the attachment",
+            "additionalProperties": true
           }
         }
       },