input[type='file'] {
    display: none;
}

.form-item-package-yaml .js-form-managed-file.form-managed-file input[type='file'] {
display:block;
} 

.js-form-item.form-item.js-form-type-managed-file.form-type-managed-file.js-form-item-upload.form-item-upload label {
    display: none;
}