How do I override /theme/custom twig in my module to render input fields?

I have a module that is building a form. I want to theme the form using twig within my module so it does not interfere with my theme/custom twigs.

My buildForm function is:

public function buildForm(array $form, FormStateInterface $form_state) {    $form['name'] = array(     '#type' => 'textfield',     '#title' => $this->t('Name'),     '#title_display' => 'invisible',     '#required' => TRUE,   );    $form['#theme'] = 'custom_form';    return $form; } 

I have set the theme for the form as custom_form and it works fine using this in my .module file:

function custom_module_theme($existing, $type, $theme, $path) {   return array(     'custom_form' => array(       'render element' => 'form',     ),     'input' => array(       'template' => 'input',       'render element' => 'element',     ),   ); } 

However the input fields are still being rendered using input.html.twig file in my /theme/custom theme folder.

I have created copied the twig template file using the same name and placed it in my custom_module folder however Drupal is still using my theme input.html.twig file.

How do I override this twig and use the input.html.twig file in my custom_module templates folder?

Thanks

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