The lawyer asked me to spend an hour refiling these documents because there were mistakes in the last submission.

refiling 是动词 refile 的现在分词形式。refile 由前缀 re-（表示“重新”）和动词 file（归档、提交）组成，意思是“重新整理或重新提交文件”。refiling 在这里指“重新整理文件”的动作。