How did I fix «Class "Zend_Mime" not found» in `vendor/fooman/emailattachments-m2/src/Model/Attachment.php:31` on `bin/magento setup:di:compile`?

1

How did I fix «Root composer.json requires fooman/emailattachments-m2 3.6.1, it is satisfiable <…> from <…> (https://repo.packagist.org) <…> but <…> (https://repo.magento.com) has higher repository priority»?

2

rm -rf composer.lock
composer clear-cache
composer remove fooman/emailattachments-m2 --ignore-platform-req=ext-ftp
composer require fooman/emailattachments-m2:3.6.1 --ignore-platform-req=ext-ftp