tauri-plugins-workspace/.changes/upload-options.md

upload, upload-js

upload	upload-js
major	major

Breaking: upload and download now take an options object as their last argument instead of positional headers, method and body arguments:

await upload(url, filePath, onProgress, { headers, method: HttpMethod.Put })
await download(url, filePath, onProgress, { headers, body })

headers accepts both a Map and a plain object. Previously a Map was silently serialized as an empty object.