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Using the Flutter Web API: This API allows for direct upload of files from the web browser using the Drag and Drop feature. In Flutter, you can directly use dart-js-interop to access the browser’s file input element and handle the file upload.

Using the HTTP package: The HTTP package in Flutter can be used to make HTTP requests to upload files. In this method, you can read the file using the dart:io library and convert it to a base64 encoded string before sending it in the HTTP request.

Using Firebase Storage: Firebase Storage is a cloud storage service that provides secure and scalable object storage for web and mobile apps. In Flutter, you can use the Firebase Storage API to upload files to the cloud storage directly from your app.

Using third-party libraries: There are several third-party libraries available for Flutter that make file uploading easier. Some popular libraries are Dio, Flutter Uploader, and File Picker.

Using Multipart Request: Multipart request is the HTTP request that allows you to send text, files as well as some other types of data from client to server. In Flutter, you can use http package to make Multipart Requests to upload files.