How to attach pdf in mail in Magento 2.4

I have custom form with add file button. Once user submit the form i need to sent form details with pdf in mail.

I tried different solutions.

and i follow this – Magento 2.4.2 How to attched PDF in Email?

but i got error like

1 exception(s):
Exception #0 (ReflectionException): Class ZendMimePartFactory does not exist

so i used Laminas in place of zend then i face same error like

1 exception(s):
Exception #0 (ReflectionException): Class LaminasMimePartFactory does not exist