Add file upload endpoint to OpenAPI specification

docs/reference/openapi-2025-05-20.yaml

@@ -1375,6 +1375,25 @@ components:
         - ObjectLayoutSet
         - ObjectLayoutCollection
         - ObjectLayoutParticipant
+    apimodel.FileUploadResponse:
+      description: The response after uploading a file
+      properties:
+        details:
+          additionalProperties: true
+          description: Additional file metadata (size, mime type, etc.)
+          type: object
+        file_id:
+          description: The file ID (IPFS CID)
+          example: bafyreie6n5l5nkbjal37su54cha4coy7qzuhrnajluzv5qd5jvtsrxkequ
+          type: string
+        object_id:
+          description: The ID of the created file object
+          example: bafyreiabc123def456
+          type: string
+      required:
+        - file_id
+        - object_id
+      type: object
     apimodel.ObjectResponse:
       properties:
         object:
@@ -3470,6 +3489,76 @@ paths:
       summary: Update object
       tags:
         - Objects
+  /v1/spaces/{space_id}/files:
+    post:
+      description: Uploads a file to the specified space using multipart/form-data.
+        The file is processed and stored, then a file object is created. Returns the
+        file object ID and file ID (IPFS CID).
+      operationId: upload_file
+      parameters:
+        - description: The version of the API to use
+          in: header
+          name: Anytype-Version
+          required: true
+          schema:
+            default: "2025-05-20"
+            type: string
+        - description: The ID of the space to upload the file to
+          in: path
+          name: space_id
+          required: true
+          schema:
+            type: string
+      requestBody:
+        content:
+          multipart/form-data:
+            schema:
+              properties:
+                file:
+                  description: The file to upload
+                  format: binary
+                  type: string
+              required:
+                - file
+              type: object
+        description: The file to upload
+        required: true
+      responses:
+        "200":
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/apimodel.FileUploadResponse"
+          description: File uploaded successfully
+        "400":
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/util.BadRequestError"
+          description: Bad request
+        "401":
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/util.UnauthorizedError"
+          description: Unauthorized
+        "429":
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/util.RateLimitError"
+          description: Rate limit exceeded
+        "500":
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/util.ServerError"
+          description: Internal server error
+      security:
+        - bearerauth: []
+      summary: Upload file
+      tags:
+        - Files
   /v1/spaces/{space_id}/properties:
     get:
       description: "⚠ Warning: Properties are experimental and may change in the next