Hi @SHUO .H ,
This issue may be caused by that PL_XXX.xlsx have been granted unique permissions. Generally, if you enable anonymous access to a SharePoint Site, you don't need to grant permission separately to specific document and everyone should have been able to see it. And yes, if you upload documents to http://win-obkrkoa5775:27095/, you can find the file in https://lab.litwareinc.pri as long as you didn’t grant unique permissions to the uploaded documents.
Back to the issue you are facing now, you have to check if PL_XXX.xlsx has unique permissions in http://win-obkrkoa5775:27095/. Delete it if you don't need the unique permissions.
If an Answer is helpful, please click "Accept Answer" and upvote it.
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.