diff --git a/desktop/app/src/electron/initializeElectron.tsx b/desktop/app/src/electron/initializeElectron.tsx
index 3da31dfcd..dc3e3d899 100644
--- a/desktop/app/src/electron/initializeElectron.tsx
+++ b/desktop/app/src/electron/initializeElectron.tsx
@@ -111,27 +111,46 @@ export function initializeElectron() {
           return undefined;
         });
     },
-    async importFile({defaultPath, extensions} = {}) {
-      const {filePaths} = await remote.dialog.showOpenDialog({
+    importFile: (async ({
+      defaultPath,
+      extensions,
+      title,
+      encoding = 'utf-8',
+      multi,
+    } = {}) => {
+      let {filePaths} = await remote.dialog.showOpenDialog({
         defaultPath,
-        properties: ['openFile'],
+        properties: [
+          'openFile',
+          ...(multi ? (['multiSelections'] as const) : []),
+        ],
         filters: extensions ? [{extensions, name: ''}] : undefined,
+        title,
       });
 
       if (!filePaths.length) {
         return;
       }
 
-      const filePath = filePaths[0];
-      const fileName = path.basename(filePath);
+      if (!multi) {
+        filePaths = [filePaths[0]];
+      }
 
-      const data = await fs.promises.readFile(filePath, {encoding: 'utf-8'});
-      return {
-        data,
-        name: fileName,
-      };
-    },
-    async exportFile(data, {defaultPath} = {}) {
+      const descriptors = await Promise.all(
+        filePaths.map(async (filePath) => {
+          const fileName = path.basename(filePath);
+
+          const data = await fs.promises.readFile(filePath, {encoding});
+          return {
+            data,
+            name: fileName,
+          };
+        }),
+      );
+
+      return multi ? descriptors : descriptors[0];
+    }) as RenderHost['importFile'],
+    async exportFile(data, {defaultPath, encoding = 'utf-8'} = {}) {
       const {filePath} = await remote.dialog.showSaveDialog({
         defaultPath,
       });
@@ -140,7 +159,7 @@ export function initializeElectron() {
         return;
       }
 
-      await fs.promises.writeFile(filePath, data);
+      await fs.promises.writeFile(filePath, data, {encoding});
       return filePath;
     },
     openLink(url: string) {
diff --git a/desktop/flipper-plugin/src/__tests__/api.node.tsx b/desktop/flipper-plugin/src/__tests__/api.node.tsx
index 3ac5fb4cc..30f61eb57 100644
--- a/desktop/flipper-plugin/src/__tests__/api.node.tsx
+++ b/desktop/flipper-plugin/src/__tests__/api.node.tsx
@@ -98,6 +98,7 @@ test('Correct top level API exposed', () => {
       "ElementsInspectorElement",
       "ElementsInspectorProps",
       "FileDescriptor",
+      "FileEncoding",
       "FlipperLib",
       "HighlightManager",
       "Idler",
diff --git a/desktop/flipper-plugin/src/index.ts b/desktop/flipper-plugin/src/index.ts
index 9550a6a5d..583e3d170 100644
--- a/desktop/flipper-plugin/src/index.ts
+++ b/desktop/flipper-plugin/src/index.ts
@@ -38,6 +38,7 @@ export {
   getFlipperLib,
   setFlipperLibImplementation as _setFlipperLibImplementation,
   FileDescriptor,
+  FileEncoding,
 } from './plugin/FlipperLib';
 export {
   MenuEntry,
diff --git a/desktop/flipper-plugin/src/plugin/FlipperLib.tsx b/desktop/flipper-plugin/src/plugin/FlipperLib.tsx
index f174ec85b..01686583c 100644
--- a/desktop/flipper-plugin/src/plugin/FlipperLib.tsx
+++ b/desktop/flipper-plugin/src/plugin/FlipperLib.tsx
@@ -14,9 +14,12 @@ import {RealFlipperClient} from './Plugin';
 import {Notification} from './Notification';
 import {DetailSidebarProps} from '../ui/DetailSidebar';
 
+export type FileEncoding = 'utf-8' | 'base64';
+
 export interface FileDescriptor {
   data: string;
   name: string;
+  path?: string;
 }
 
 /**
@@ -40,6 +43,10 @@ export interface FlipperLib {
   DetailsSidebarImplementation?(
     props: DetailSidebarProps,
   ): React.ReactElement | null;
+  /**
+   * @deprecated
+   * Will be removed in subsequent commits
+   */
   showOpenDialog?(options: {
     defaultPath?: string;
     filter?: {
@@ -52,19 +59,64 @@ export interface FlipperLib {
    * Imported file data.
    * If user cancelled a file selection - undefined.
    */
-  importFile(options: {
+  importFile(options?: {
+    /**
+     * Default directory to start the file selection from
+     */
+    defaultPath?: string;
+    /**
+     * List of allowed file extensions
+     */
+    extensions?: string[];
+    /**
+     * Open file dialog title
+     */
+    title?: string;
+    /**
+     * File encoding
+     */
+    encoding?: FileEncoding;
+    /**
+     * Allow selection of multiple files
+     */
+    multi?: false;
+  }): Promise<FileDescriptor | undefined>;
+  importFile(options?: {
     defaultPath?: string;
     extensions?: string[];
-  }): Promise<FileDescriptor | undefined>;
+    title?: string;
+    encoding?: FileEncoding;
+    multi: true;
+  }): Promise<FileDescriptor[] | undefined>;
+  importFile(options?: {
+    defaultPath?: string;
+    extensions?: string[];
+    title?: string;
+    encoding?: FileEncoding;
+    multi?: boolean;
+  }): Promise<FileDescriptor[] | FileDescriptor | undefined>;
+
   /**
    * @returns
    * An exported file path (if available) or a file name.
    * If user cancelled a file selection - undefined.
    */
   exportFile(
+    /**
+     * New file data
+     */
     data: string,
     options?: {
+      /**
+       * A file path suggestion for a new file.
+       * A dialog to save file will use it as a starting point.
+       * Either a complete path to the newly created file, a path to a directory containing the file, or the file name.
+       */
       defaultPath?: string;
+      /**
+       * File encoding
+       */
+      encoding?: FileEncoding;
     },
   ): Promise<string | undefined>;
   paths: {
diff --git a/desktop/flipper-ui-core/src/RenderHost.tsx b/desktop/flipper-ui-core/src/RenderHost.tsx
index 92af9366b..391d50ce6 100644
--- a/desktop/flipper-ui-core/src/RenderHost.tsx
+++ b/desktop/flipper-ui-core/src/RenderHost.tsx
@@ -59,6 +59,9 @@ export interface RenderHost {
   writeTextToClipboard(text: string): void;
   /**
    * @deprecated
+   * WARNING!
+   * It is a low-level API call that might be removed in the future.
+   * It is not really deprecated yet, but we'll try to make it so.
    * TODO: Remove in favor of "exportFile"
    */
   showSaveDialog?(options: {
@@ -68,9 +71,18 @@ export interface RenderHost {
   }): Promise<string | undefined>;
   /**
    * @deprecated
+   * WARNING!
+   * It is a low-level API call that might be removed in the future.
+   * It is not really deprecated yet, but we'll try to make it so.
    * TODO: Remove in favor of "importFile"
    */
-  showOpenDialog?: FlipperLib['showOpenDialog'];
+  showOpenDialog?(options: {
+    defaultPath?: string;
+    filter?: {
+      extensions: string[];
+      name: string;
+    };
+  }): Promise<string | undefined>;
   showSelectDirectoryDialog?(defaultPath?: string): Promise<string | undefined>;
   importFile: FlipperLib['importFile'];
   exportFile: FlipperLib['exportFile'];