Update Collection Item(s)

<Note title="Components in Rich Text (beta)"> Rich Text field values may contain Webflow component instances as `<wf-component>` markup. On read they appear inline in the field's HTML; on write, the same markup creates or updates the instance. Scalar props are `prop-<propId>="…"` attributes on the `<wf-component>`. Text and rich-text props are nested `<wf-prop type="text|richtext">…</wf-prop>` children. A write is rejected with a `400` if a component can't be resolved, isn't allowed in Rich Text (e.g. it contains a Slot or Collection List), includes an unknown prop, or creates a new instance in a secondary locale. `component-id` and each `prop-<propId>` are specific to your site's component definition — obtain them by listing your site's components (`GET /v2/sites/{site_id}/components`, plus `/components/{component_id}/properties` for prop IDs) or by reading an item that already contains the component and reusing the returned markup. Omit `data-w-id` when creating an instance (the server assigns it); keep it when updating one. </Note> Update a single item or multiple items (up to 100) in a Collection. **Note:** If the `cmsLocaleId` parameter is undefined or empty and the items are localized, items will be updated only in the primary locale. Required scope | `CMS:write`