DOC-6096 RS: Clarified that upload custom module artifact REST API requests require the module .zip file (#2540)

Author: rrelledge

content/operate/oss_and_stack/stack-with-enterprise/install/add-module-to-cluster.md

@@ -59,7 +59,7 @@ To add a custom module to a cluster running Redis Enterprise Software version 8.
 
     ```sh
     POST https://<host>:<port>/v2/local/modules/user-defined/artifacts
-    "module=@/tmp/custom-module.so"
+    "module=@/tmp/custom-module.zip"
     ```
 
     The *module* parameter specifies the full path of the module artifact and must be submitted as form-data. In addition, the module artifact must be available and accessible to the server processing the request.

content/operate/rs/references/rest-api/requests/modules/user-defined.md

@@ -79,7 +79,7 @@ Returns a JSON array of custom module artifacts.
 POST /v2/modules/user-defined
 ```
 
-Creates a module object in the cluster configuration store (CCS). After calling this endpoint, you still need to upload the module's `.so` file to each node by calling [`POST /v2/local/modules/user-defined/artifacts`](#post-local-user-defined-artifacts) on each node.
+Creates a module object in the cluster configuration store (CCS). After calling this endpoint, you still need to upload the module's `.zip` file, which contains the `.so` and `module.json` files, to each node by calling [`POST /v2/local/modules/user-defined/artifacts`](#post-local-user-defined-artifacts) on each node.
 
 #### Permissions
 
@@ -170,6 +170,18 @@ POST /v2/local/modules/user-defined/artifacts
 
 A local API to upload a custom module's artifact to the current node. You must call this API on each cluster node.
 
+The module must be packaged as a `.zip` file containing:
+
+- **module.json**: A metadata file with module information including:
+  - `module_name`: The actual module name
+  - `version`: Numeric version
+  - `semantic_version`: Semantic version string (for example, "1.0.0")
+  - `min_redis_version`: Minimum compatible Redis version
+  - `commands`: List of commands the module provides
+  - `capabilities`: List of module capabilities
+
+- **Module binary**: The compiled `.so` file for the target platform
+
 #### Permissions
 
 | Permission name | Roles |