Email attachments (FileUpload) not working

I have the following simple email form:

public static function form(Form $form): Form
{
    return $form
        ->schema([
            TextInput::make('subject')
                ->required()
                ->label('Email Subject'),
            RichEditor::make('body')
                ->required()
                ->label('Email Body'),
            FileUpload::make('attachments')
                ->multiple()
                ->label('Attachments')
                ->disk('public')
        ])
        ->statePath('data');
}

public function submit()
{
    $subjectLine = $this->form->getState()['subject'];
    $emailBody = $this->form->getState()['body'];
    $attachments = $this->form->getState()['attachments'];

    $emailAddresses = $this->records['emails'];
    
    foreach ($emailAddresses as $emailAddress) {
        Mail::to(
            $emailAddress
            )->send(
                new BulkEventEmail(
                    $subjectLine, 
                    $emailBody, 
                    $attachments
                )
            );
    }
}

public static function form(Form $form): Form
{
    return $form
        ->schema([
            TextInput::make('subject')
                ->required()
                ->label('Email Subject'),
            RichEditor::make('body')
                ->required()
                ->label('Email Body'),
            FileUpload::make('attachments')
                ->multiple()
                ->label('Attachments')
                ->disk('public')
        ])
        ->statePath('data');
}

public function submit()
{
    $subjectLine = $this->form->getState()['subject'];
    $emailBody = $this->form->getState()['body'];
    $attachments = $this->form->getState()['attachments'];

    $emailAddresses = $this->records['emails'];
    
    foreach ($emailAddresses as $emailAddress) {
        Mail::to(
            $emailAddress
            )->send(
                new BulkEventEmail(
                    $subjectLine, 
                    $emailBody, 
                    $attachments
                )
            );
    }
}

It works just fine if I only send a subject line and body. If I add any attachments however, it gives me the attached error. I also logged it like so:

    Log::info('Attachments:', ['attachments' => $attachments])

    Log::info('Attachments:', ['attachments' => $attachments])

Here is the results of that:

[2024-09-21 01:10:23] production.INFO: Attachments: {["UaJx4a4GXjJdbU03KMFztS5EHyqQat-metacm91dGVzX291dHB1dC5jc3Y=-.csv"]}

[2024-09-21 01:10:23] production.INFO: Attachments: {["UaJx4a4GXjJdbU03KMFztS5EHyqQat-metacm91dGVzX291dHB1dC5jc3Y=-.csv"]}

Attached is the part of my code error message highlights. As this is a totally unhelpful error, also attached is the only suspicious vendor frame I saw. Looks like it wants the attachments to be sent through as a nested array... I tried manually building it like that, no luck. I'm out of characters, so I've also attached the attachments portion of my mailable. Any ideas how to do this properly?

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Email attachments (FileUpload) not working