https://www.cosmosfarm.com/threads/document/56532

		<!-- 첨부파일 시작 -->
		<?php for($attached_index=1; $attached_index<=$board->meta->max_attached_count; $attached_index++):?>
		<div class="kboard-attr-row <?php echo esc_attr($field['class'])?> attach-<?php echo $attached_index?>">
			<label class="attr-name" for="kboard-input-file<?php echo $attached_index?>"><span class="field-name"><?php echo esc_html($field_name)?></span><?php echo $attached_index?></label>
			<div class="attr-value">
				<?php if(isset($content->attach->{"file{$attached_index}"})):?><?php echo $content->attach->{"file{$attached_index}"}[1]?> - <a href="<?php echo $url->getDeleteURLWithAttach($content->uid, "file{$attached_index}")?>" onclick="return confirm('<?php echo __('Are you sure you want to delete?', 'kboard')?>');"><?php echo __('Delete file', 'kboard')?></a><?php endif?>
				<input type="file" id="kboard-input-file<?php echo $attached_index?>" name="kboard_attach_file<?php echo $attached_index?>" <?php echo $content->attach->{"file{$attached_index}"}[1] ? '' : 'required';?>>
				<?php if(isset($field['description']) && $field['description']):?><div class="description"><?php echo esc_html($field['description'])?></div><?php endif?>
			</div>
		</div>
		<?php endfor?>
		<!-- 첨부파일 끝 -->

고맙습니다.

저소스를 어디다가 넣나요? 비슷한 소스가 많아서 감이 안오네요 ㅠㅠ

<?php elseif($field['field_type'] == 'attach'):?>
	<?php if($board->meta->max_attached_count > 0):?>
		<!-- 첨부파일 시작 -->
		<?php for($attached_index=1; $attached_index<=$board->meta->max_attached_count; $attached_index++):?>
		<div class="kboard-attr-row <?php echo $content->attach->{"file{$attached_index}"}[1] ? '' : 'required';?>>
			<label class="attr-name" for="kboard-input-file<?php echo $attached_index?>"><span class="field-name"><?php echo esc_html($field_name)?></span> <span class="attr-required-text">*</span></label>
			<div class="attr-value">
				<?php if(isset($content->attach->{"file{$attached_index}"})):?><?php echo $content->attach->{"file{$attached_index}"}[1]?> - <a href="<?php echo $url->getDeleteURLWithAttach($content->uid, "file{$attached_index}")?>" onclick="return confirm('<?php echo __('Are you sure you want to delete?', 'kboard')?>');"><?php echo __('Delete file', 'kboard')?></a><?php endif?>
				<input type="file" class="required" id="kboard-input-file<?php echo $attached_index?>" name="kboard_attach_file<?php echo $attached_index?>">
                <span class="filenotice">Attachment format is hwp, doc, pdf, docx!</span>
				<?php if(isset($field['description']) && $field['description']):?><div class="description"><?php echo esc_html($field['description'])?></div><?php endif?>
			</div>
		</div>
		<?php endfor?>

이게 맞나요?

아래 예시 코드처럼 첨부파일이 있을 때는 required를 출력하지 않고, 없을때만 출력하여

글 수정 시 첨부파일이 있는 경우는 경고창 없이 저장되게 할 수 있습니다.

<?php echo $content->attach->{"file{$attached_index}"}[1] ? '' : 'required';?>

수정하셨던 위치에 적절히 입력하여 확인해보시겠어요?

고맙습니다.