Feature Request / API Limitation: Image Attachments & Uploads in Calendar Events REST API

Feature Request / API Limitation: Image Attachments & Uploads in Calendar Events REST API (POST /calendar/events)

(Regarding V5.X hosted solution)

When creating or editing calendar events via the frontend web UI, users can seamlessly upload an event Cover photo. The web form handles this via a multipart file uploader that generates a temporary attachment reference (attach_id) linked to the event record.

However, when utilizing the REST API endpoint (POST /calendar/events), the JSON payload schema does not expose a mechanism to pass binary image files, reference a remote image URL, or map an existing attachment ID. Consequently, programmatically created events are generated completely stripped of images.

Question:

1. Is there an undocumented parameter, secondary endpoint, or ID mapping workflow within the current REST API to attach an image to a calendar event upon creation?

2. If not, can the calendar events REST API schema be updated to support image attachments (either via multipart/form-data or an attachment ID reference) to achieve parity with the web UI?