Update user meta with value processed in form submition

I need to run the function wp_handle_upload() on file sent by form contain file field, and then use returned value of this function to update the meta user after registered.

In addition to several other attempts my last were:

add_action("gform_after_submission_5", "v5_armazena_avatar");
function v5_armazena_avatar() {
	global $avatar;
	$avatar = wp_handle_upload( $_FILES['input_5'], array( 'test_form' => false ) );
}

add_action("gform_user_registered", "v5_atualiza_avatar", 10 );
function v5_atualiza_avatar($user_id) {
	global $avatar;
	update_user_meta( $user_id, 'simple_local_avatar', array( 'full' => $avatar['url'] ) );
}

Currently the custom meta user is stored with value: a:1:{s:4:"full";s:0:"";}

The problem is that I do not know at wich hook I have access to the global PHP $ _FILES.

I also tried gform_pre_submission hook.

Any thoughts will be appreciated.

Thanks.

Hi Chris,

when tested at gform_pre_submission hook then started to work, pretty weird, but great, I got what I wanted.

Thank you for your attention!

Regards.