Improved Extension Uploading

mahmoud_hooda · September 29, 2025, 7:17pm

Am I the only one facing issues when trying to upload extensions larger than 2–3 MB? I often get a vague Upload Error. It would be helpful if MIT App Inventor improved the uploading process by:

Allowing larger extension sizes for 6 MB as mit ai2 sayed
Showing upload progress
Providing clear error messages (e.g., why the upload failed) instead of just Upload Error

mahmoud_hooda · October 2, 2025, 5:38pm

Her is it class of Upload extension:

github.com

mit-cml/appinventor-sources/blob/master/appinventor/appengine/src/com/google/appinventor/client/utils/Uploader.java

// -*- mode: java; c-basic-offset: 2; -*-
// Copyright 2009-2011 Google, All Rights reserved
// Copyright 2011-2012 MIT, All rights reserved
// Released under the Apache License, Version 2.0
// http://www.apache.org/licenses/LICENSE-2.0

package com.google.appinventor.client.utils;

import com.google.appinventor.shared.rpc.UploadResponse;
import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.FileUpload;
import com.google.gwt.user.client.ui.FormHandler;
import com.google.gwt.user.client.ui.FormPanel;
import com.google.gwt.user.client.ui.FormSubmitCompleteEvent;
import com.google.gwt.user.client.ui.FormSubmitEvent;
import com.google.gwt.user.client.ui.RootPanel;

/**
 * Utility class to upload files to the server.

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