How to make web page remember last open file directory?

I have a Windows application based on Qt WebEngineView (in QML). There are web pages in my app. Some web page need user to select files using:

<input type="file" />

I want to know, is it possible for my app to remember the last directory user selected a file?

I have tried:

• Set value property to <input> in my web page, but it is not allowed by browser to set it programmatically, see Set default value for a input file form.
• Open my web pages in Chrome, Chrome can remember last directory. But in my app, every time it opens the directory where the app is installed.
• In native Open File Dialog, I can set an initial directory, but can I do the same for Open File Dialog in web pages?

I know this may be impossible. Any suggestions and workarounds are appreciated.

The WebEngineView element has a signal for when the Web content requests a file dialog.

The FileDialog element has a property for setting (and getting) the folder.

So something along these lines should work

FileDialog {
    id: dialog

    property var request

    onRejected: request.dialogReject()

    onAccepted: {
        yourSavedFolder = folder;

        request.dialogAccept(files);
    }
}

WebEngineView {
    onFileDialogRequested: {
        request.accepted = true; // inhibit default dialog

        dialog.request = request;
        dialog.folder = yourSavedFolder;
        dialog.open()
    }
}

This is just a rough sketch, you'll also need to handle the open mode of the request object, etc.