diff --git a/demo/js/index.js b/demo/js/index.js
index 28e24e5f..2187499c 100644
--- a/demo/js/index.js
+++ b/demo/js/index.js
@@ -152,6 +152,13 @@ Raven.context(async () => {
         // @ts-ignore
         "butterchurn");
       },
+      importConvertPreset: () => {
+        return import(/* webpackChunkName: "milkdrop-preset-converter" */
+        // @ts-ignore
+        "milkdrop-preset-converter-aws");
+      },
+      presetConverterEndpoint:
+        "https://p2tpeb5v8b.execute-api.us-east-2.amazonaws.com/default/milkdropShaderConverter",
       getPresets: async () => {
         if ("URLSearchParams" in window) {
           const params = new URLSearchParams(location.search);
diff --git a/js/actionCreators/milkdrop.ts b/js/actionCreators/milkdrop.ts
index 1d83e111..073d5b20 100644
--- a/js/actionCreators/milkdrop.ts
+++ b/js/actionCreators/milkdrop.ts
@@ -66,29 +66,23 @@ export function loadPresets(presets: StatePreset[]): Dispatchable {
 }
 
 export function appendPresetFileList(fileList: FileList): Dispatchable {
-  return async dispatch => {
-    const presets: StatePreset[] = Array.from(fileList).map(
-      (file): StatePreset => {
+  return async (dispatch, getState, { convertPreset }) => {
+    const presets: StatePreset[] = Array.from(fileList)
+      .map(file => {
         const JSON_EXT = ".json";
         const MILK_EXT = ".milk";
         const filename = file.name.toLowerCase();
         if (filename.endsWith(MILK_EXT)) {
-          throw new Error(".milk preset support not yet implemented");
-          // Not sure why we need this type definition.
-          /*
-        const lazy: LazyButterchurnPresetJson = {
-          type: "LAZY_BUTTERCHURN_JSON",
-          name: file.name.slice(0, file.name.length - MILK_EXT.length),
-          getDefinition: async () => {
-            // TODO: Post this blob to the url end point and get the json back
-            return {};
+          if (convertPreset == null) {
+            throw new Error("Invalid type");
           }
-        };
-        return lazy;
-        */
+          return {
+            type: "UNRESOLVED",
+            name: file.name.slice(0, file.name.length - MILK_EXT.length),
+            getPreset: async () => convertPreset(file)
+          } as StatePreset;
         } else if (filename.endsWith(JSON_EXT)) {
-          // Not sure why we need this type definition.
-          const lazy: StatePreset = {
+          return {
             type: "UNRESOLVED",
             name: file.name.slice(0, file.name.length - JSON_EXT.length),
             getPreset: async () => {
@@ -96,13 +90,13 @@ export function appendPresetFileList(fileList: FileList): Dispatchable {
               // TODO: How should we handle the case where json parsing fails?
               return JSON.parse(str);
             }
-          };
-          return lazy;
+          } as StatePreset;
         } else {
           throw new Error("Invalid type");
         }
-      }
-    );
+        return null as never;
+      })
+      .filter(Boolean);
     dispatch(loadPresets(presets));
     // TODO: Select the first of these presets
   };
diff --git a/js/components/MilkdropWindow/options.ts b/js/components/MilkdropWindow/options.ts
deleted file mode 100644
index 02c3738a..00000000
--- a/js/components/MilkdropWindow/options.ts
+++ /dev/null
@@ -1,12 +0,0 @@
-import { ButterchurnOptions } from "../../types";
-
-async function loadConvertPreset() {
-  const { convertPreset } =
-    // prettier-ignore
-    await import(
-    /* webpackChunkName: "milkdrop-preset-converter" */
-    // @ts-ignore
-    "milkdrop-preset-converter-aws"
-  );
-  return convertPreset;
-}
diff --git a/js/types.ts b/js/types.ts
index 47d27c4a..348c35cd 100644
--- a/js/types.ts
+++ b/js/types.ts
@@ -146,6 +146,11 @@ export type PresetId = string;
 export interface ButterchurnOptions {
   getPresets(): Promise<Preset[]>;
   importButterchurn(): Promise<any>;
+  importConvertPreset?: () => Promise<{
+    convertPreset(file: string, endpoint: string): Promise<Object>;
+  }>;
+  presetConverterEndpoint?: string;
+  butterchurnOpen: boolean;
 }
 
 export interface EqfPreset {
@@ -628,8 +633,9 @@ export interface IMusicMetadataBrowserApi {
 }
 
 export interface Extras {
-  requireJSZip: () => Promise<never>;
-  requireMusicMetadata: () => Promise<IMusicMetadataBrowserApi>;
+  requireJSZip(): Promise<never>;
+  requireMusicMetadata(): Promise<IMusicMetadataBrowserApi>;
+  convertPreset: ((file: File) => Promise<Object>) | null;
 }
 
 export type GetState = () => AppState;
diff --git a/js/webampLazy.tsx b/js/webampLazy.tsx
index 5d63b28d..c3ecef12 100644
--- a/js/webampLazy.tsx
+++ b/js/webampLazy.tsx
@@ -8,7 +8,8 @@ import {
   Track,
   LoadedURLTrack,
   Middleware,
-  WindowPosition
+  WindowPosition,
+  ButterchurnOptions
 } from "./types";
 import getStore from "./store";
 import App from "./components/App";
@@ -19,6 +20,7 @@ import * as Actions from "./actionCreators";
 
 import { LOAD_STYLE } from "./constants";
 import * as Utils from "./utils";
+import * as FileUtils from "./fileUtils";
 
 import {
   SET_AVAILABLE_SKINS,
@@ -118,7 +120,7 @@ interface PrivateOptions {
       position: WindowPosition;
     };
   };
-  __butterchurnOptions: { butterchurnOpen: boolean };
+  __butterchurnOptions: ButterchurnOptions;
 }
 
 // Return a promise that resolves when the store matches a predicate.
@@ -170,9 +172,29 @@ class Winamp {
       enableHotkeys = false,
       zIndex,
       requireJSZip,
-      requireMusicMetadata
+      requireMusicMetadata,
+      __butterchurnOptions
     } = this.options;
 
+    // TODO: Make this much cleaner
+    let convertPreset = null;
+    if (__butterchurnOptions != null) {
+      const {
+        importConvertPreset,
+        presetConverterEndpoint
+      } = __butterchurnOptions;
+
+      if (importConvertPreset != null && presetConverterEndpoint != null) {
+        convertPreset = async (file: File): Promise<Object> => {
+          const { convertPreset } = await importConvertPreset();
+          return convertPreset(
+            await FileUtils.genStringFromFileReference(file),
+            presetConverterEndpoint
+          );
+        };
+      }
+    }
+
     // TODO: Validate required options
 
     this.media = new Media();
@@ -181,7 +203,7 @@ class Winamp {
       this._actionEmitter,
       this.options.__customMiddlewares,
       this.options.__initialState,
-      { requireJSZip, requireMusicMetadata }
+      { requireJSZip, requireMusicMetadata, convertPreset }
     ) as Store;
 
     if (navigator.onLine) {