diff --git a/packages/frontend/src/components/MkDriveSelectDialog.vue b/packages/frontend/src/components/MkDriveSelectDialog.vue
index e65f4dd403..cd756d50ff 100644
--- a/packages/frontend/src/components/MkDriveSelectDialog.vue
+++ b/packages/frontend/src/components/MkDriveSelectDialog.vue
@@ -39,13 +39,13 @@ withDefaults(defineProps<{
 });
 
 const emit = defineEmits<{
-	(ev: 'done', r?: Misskey.entities.DriveFile[]): void;
+	(ev: 'done', r?: Misskey.entities.DriveFile[] | Misskey.entities.DriveFolder[]): void;
 	(ev: 'closed'): void;
 }>();
 
 const dialog = shallowRef<InstanceType<typeof MkModalWindow>>();
 
-const selected = ref<Misskey.entities.DriveFile[]>([]);
+const selected = ref<Misskey.entities.DriveFile[] | Misskey.entities.DriveFolder[]>([]);
 
 function ok() {
 	emit('done', selected.value);
@@ -57,7 +57,7 @@ function cancel() {
 	dialog.value?.close();
 }
 
-function onChangeSelection(files: Misskey.entities.DriveFile[]) {
-	selected.value = files;
+function onChangeSelection(v: Misskey.entities.DriveFile[] | Misskey.entities.DriveFolder[]) {
+	selected.value = v;
 }
 </script>
diff --git a/packages/frontend/src/os.ts b/packages/frontend/src/os.ts
index f04aced4db..77d74b0bef 100644
--- a/packages/frontend/src/os.ts
+++ b/packages/frontend/src/os.ts
@@ -162,7 +162,12 @@ type EmitsExtractor<T> = {
 	[K in keyof T as K extends `onVnode${string}` ? never : K extends `on${infer E}` ? Uncapitalize<E> : K extends string ? never : K]: T[K];
 };
 
-export async function popup<T extends Component>(component: T, props: ComponentProps<T>, events: ComponentEmit<T> = {} as ComponentEmit<T>, disposeEvent?: keyof ComponentEmit<T>) {
+export async function popup<T extends Component>(
+	component: T,
+	props: ComponentProps<T>,
+	events: ComponentEmit<T> = {} as ComponentEmit<T>,
+	disposeEvent?: keyof ComponentEmit<T>,
+): Promise<{ dispose: () => void }> {
 	markRaw(component);
 
 	const id = ++popupIdCount;
@@ -246,7 +251,9 @@ export function actions<T extends {
 	title?: string;
 	text?: string;
 	actions: T;
-}): Promise<{ canceled: true; result: undefined; } | {
+}): Promise<{
+	canceled: true; result: undefined;
+} | {
 	canceled: false; result: T[number]['value'];
 }> {
 	return new Promise(resolve => {
@@ -277,7 +284,9 @@ export function inputText(props: {
 	default?: string | null;
 	minLength?: number;
 	maxLength?: number;
-}): Promise<{ canceled: true; result: undefined; } | {
+}): Promise<{
+	canceled: true; result: undefined;
+} | {
 	canceled: false; result: string;
 }> {
 	return new Promise(resolve => {
@@ -306,7 +315,9 @@ export function inputNumber(props: {
 	placeholder?: string | null;
 	autocomplete?: string;
 	default?: number | null;
-}): Promise<{ canceled: true; result: undefined; } | {
+}): Promise<{
+	canceled: true; result: undefined;
+} | {
 	canceled: false; result: number;
 }> {
 	return new Promise(resolve => {
@@ -332,7 +343,9 @@ export function inputDate(props: {
 	text?: string;
 	placeholder?: string | null;
 	default?: string | null;
-}): Promise<{ canceled: true; result: undefined; } | {
+}): Promise<{
+	canceled: true; result: undefined;
+} | {
 	canceled: false; result: Date;
 }> {
 	return new Promise(resolve => {
@@ -352,7 +365,9 @@ export function inputDate(props: {
 	});
 }
 
-export function authenticateDialog(): Promise<{ canceled: true; result: undefined; } | {
+export function authenticateDialog(): Promise<{
+	canceled: true; result: undefined;
+} | {
 	canceled: false; result: { password: string; token: string | null; };
 }> {
 	return new Promise(resolve => {
@@ -372,7 +387,9 @@ export function select<C = any>(props: {
 		value: C;
 		text: string;
 	}[];
-}): Promise<{ canceled: true; result: undefined; } | {
+}): Promise<{
+	canceled: true; result: undefined;
+} | {
 	canceled: false; result: C;
 }> {
 	return new Promise(resolve => {
@@ -418,7 +435,7 @@ export function waiting(): Promise<void> {
 	});
 }
 
-export function form(title: string, form: any) {
+export function form(title: string, form: any): Promise<unknown> {
 	return new Promise(resolve => {
 		popup(defineAsyncComponent(() => import('@/components/MkFormDialog.vue')), { title, form }, {
 			done: result => {
@@ -456,7 +473,7 @@ export async function selectDriveFile(multiple: boolean): Promise<Misskey.entiti
 	});
 }
 
-export async function selectDriveFolder(multiple: boolean) {
+export async function selectDriveFolder(multiple: boolean): Promise<Misskey.entities.DriveFolder[]> {
 	return new Promise(resolve => {
 		popup(defineAsyncComponent(() => import('@/components/MkDriveSelectDialog.vue')), {
 			type: 'folder',
@@ -464,14 +481,14 @@ export async function selectDriveFolder(multiple: boolean) {
 		}, {
 			done: folders => {
 				if (folders) {
-					resolve(multiple ? folders : folders[0]);
+					resolve(folders);
 				}
 			},
 		}, 'closed');
 	});
 }
 
-export async function pickEmoji(src: HTMLElement | null, opts) {
+export async function pickEmoji(src: HTMLElement | null, opts): Promise<unknown> {
 	return new Promise(resolve => {
 		popup(MkEmojiPickerDialog, {
 			src,
diff --git a/packages/frontend/src/pages/settings/drive.vue b/packages/frontend/src/pages/settings/drive.vue
index c3ce89d144..1c0e182080 100644
--- a/packages/frontend/src/pages/settings/drive.vue
+++ b/packages/frontend/src/pages/settings/drive.vue
@@ -113,7 +113,7 @@ if (defaultStore.state.uploadFolder) {
 
 function chooseUploadFolder() {
 	os.selectDriveFolder(false).then(async folder => {
-		defaultStore.set('uploadFolder', folder ? folder.id : null);
+		defaultStore.set('uploadFolder', folder[0] ? folder[0].id : null);
 		os.success();
 		if (defaultStore.state.uploadFolder) {
 			uploadFolder.value = await misskeyApi('drive/folders/show', {
diff --git a/packages/frontend/src/widgets/WidgetSlideshow.vue b/packages/frontend/src/widgets/WidgetSlideshow.vue
index f2fc24ddf7..a98f6fb8a1 100644
--- a/packages/frontend/src/widgets/WidgetSlideshow.vue
+++ b/packages/frontend/src/widgets/WidgetSlideshow.vue
@@ -93,10 +93,10 @@ const fetch = () => {
 
 const choose = () => {
 	os.selectDriveFolder(false).then(folder => {
-		if (folder == null) {
+		if (folder[0] == null) {
 			return;
 		}
-		widgetProps.folderId = folder.id;
+		widgetProps.folderId = folder[0].id;
 		save();
 		fetch();
 	});