Hi @Xu, Jia/许 佳 ,
You could get details about your downloaded file in Microsoft 365 compliance center like following steps shows.
Microsoft 365 compliance center > Solutions > Audit > select Date and time range > select "Downloaded file" in Activities drop and down menu > type your file url in File, folder, or site
For Example:
My search result:
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.