The best alternatives to Uploader Window are Workbox, Uppy, and Uploadcare. If these 3 options don't work for you, we've listed a few more alternatives below.
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Uppy is a sleek, modular JavaScript file uploader that integrates seamlessly with any application. It’s fast, easy to use and lets you worry about more important problems than building a file uploader. - Fetch ...
Simple file uploader and powerful APIs to upload, transform, and deliver any file into your app. Filestack is a cloud-based file-handling platform that allows users to upload, store, and manage files in the clo...
An open-source, plug-and-play File Picker that connects to many cloud storage APIs like Box, Dropbox, Google Drive, OneDrive, Sharepoint and offers easy file uploads and downloads between your app and any cloud...