How to open a file in lxplus /tmp under ROOT? [Solved]

I logged into Lxplus.
When I input “.!ls /tmp/username” under root, it shows me no file.
When I exit root and type “ls /tmp/username/”, it shows me files.
I cannot open the files in tmp with TFile either.

I have to run it in the same lxplus machine because the /tmp isn’t mounted on AFS.