rename back to MediaPicker3 because that is what the server expects

src/Umbraco.Web.UI.Client/src/packages/core/property-editor/schemas/Umbraco.MediaPicker.ts

@@ -3,7 +3,7 @@ import type { ManifestPropertyEditorSchema } from '@umbraco-cms/backoffice/exten
 export const manifest: ManifestPropertyEditorSchema = {
 	type: 'propertyEditorSchema',
 	name: 'Media Picker',
-	alias: 'Umbraco.MediaPicker',
+	alias: 'Umbraco.MediaPicker3',
 	meta: {
 		defaultPropertyEditorUiAlias: 'Umb.PropertyEditorUi.MediaPicker',
 		settings: {

src/Umbraco.Web.UI.Client/src/packages/media/media/property-editors/media-picker/manifests.ts

@@ -3,11 +3,11 @@ import type { ManifestPropertyEditorUi } from '@umbraco-cms/backoffice/extension
 export const manifest: ManifestPropertyEditorUi = {
 	type: 'propertyEditorUi',
 	alias: 'Umb.PropertyEditorUi.MediaPicker',
-	name: 'Markdown Editor Property Editor UI',
+	name: 'Media Picker Property Editor UI',
 	js: () => import('./property-editor-ui-media-picker.element.js'),
 	meta: {
 		label: 'Media Picker',
-		propertyEditorSchemaAlias: 'Umbraco.MediaPicker',
+		propertyEditorSchemaAlias: 'Umbraco.MediaPicker3',
 		icon: 'icon-picture',
 		group: 'pickers',
 	},