How to programmatically upload a file to a Dropbox File Request link from iOS (SwiftUI)?

### Summary

I am building an iOS app using SwiftUI, and I have local file URLs (`[URL]`) generated within the app. I would like to programmatically upload these files to a Dropbox **File Request** URL (e.g. `https://www.dropbox.com/request/XYZ...`).

### What I Tried

- I attempted using `WKWebView` to load the file request link and inject JavaScript to pre-fill or simulate file input selection — but this does not work due to iOS sandboxing and gesture restrictions.
- The `files.upload(path:..., input:...)` API from the Dropbox SDK doesn't work, since File Request URLs are not API-accessible paths.
- I couldn't find any Dropbox API documentation that allows programmatically sending files to a File Request endpoint.

### Question

➡️ Is it possible to upload a file **from an iOS app** (Swift or SwiftUI) to a **Dropbox File Request URL** programmatically?
➡️ If not, is there a recommended workaround to help users complete this flow smoothly?

Thanks in advance for any clarification or guidance!