Supporting Uploads

We are currently using flutter_uploader, for sending data and uploads in flutter. flutter_uploader was inspired by this plugin, and it seems a little unnecessary to have two plugins that operate in very similar ways - one for upload and one for download.

Would the project authors consider adding support for uploading files (which is pretty much just a different HTTP method and a pointer to a file to send) so that this plugin was a flutter_updownloader or similar?

Start by reviewing the existing Flutter downloader plugin and comparing its download flow with flutter_uploader. Determine how upload requests, file selection, background execution, and platform support should fit the current design. Done means the plugin supports uploading files with behavior consistent across the platforms it already supports.

Written by the indexing model from the issue text.