The HasForms trait

use RoundlyConsulting\Forms\Concerns\HasForms;

class User extends Authenticatable
{
    use HasForms;
}

$user->submitTo($form, request());     // Forms::submit with $user as sender
$user->draftTo($form, request());      // Forms::draft — both go through the manager, so Forms::fake() records them
$user->formSubmissions;                // morphMany of the user's per-field Submission rows (one per answered field)
Forms::submissions($form)->forSender($user)->get(); // the user's whole submissions, assembled

$user->submitTo($form, request(), bypassClosed: true);   // trusted path
$user->draftTo($form, request(), uuid: $draft->uuid);    // resume a draft

$user->formSubmissions()->where('form_id', $form->getKey())->get();