[feature] Rename attachments (#11920)

* Implementation

* Update API and CHANGELOG

* Annotate response type

* Simplify attachment renaming

- Use the existing API endpoint

* Capture the actual saved path

* Tweak attachment table fields

* Use built-in validation

* Update docs

* Unit testing

* Ignore some lines from coverage

* Check if file exists before deleting

docs/docs/concepts/attachments.md

@@ -16,3 +16,23 @@ Parameters can be associated with various InvenTree models.
 Any model which supports attachments will have an "Attachments" tab on its detail page. This tab displays all attachments associated with that object:
 
 {{ image("concepts/attachments-tab.png", "Order Attachments Example") }}
+
+## Attachments Types
+
+The following types of attachments are supported:
+
+### File Attachments
+
+File attachments allow users to upload files directly to InvenTree. These files are stored on the server and can be downloaded or viewed by users with appropriate permissions.
+
+### Link Attachments
+
+Link attachments allow users to associate external URLs with an object. This can be useful for linking to external documentation, resources, or other relevant web content.
+
+## Adding Attachments
+
+To add an attachment to an object, navigate to the object's detail page and click on the "Attachments" tab. From there, you can click the "Add attachment" button to upload a file or the "Add external link" button to add a link.
+
+### Renaming Attachments
+
+Once a file attachment has been uploaded, it can be renamed by clicking the "Edit" action associated with the attachment. This allows you to change the filename without needing to re-upload the file. The system will handle renaming the file on the server and updating the database record accordingly.