[Resolved]How to find out the log for new data import tool


When I use new data import tool, there is an issue.
Like in snapshot below I just did an import, system told me Partial Success
I believe that means some of rows unsuccessful but I cannot find out log info. Somehow there is no such button Export Errored Rows beside Map Columns.
So how can I find out the log with errors?


After wait a while, i will be able to see the Export Errored Rows.
Now I know which parts unsuccessfully.
Seems nothing to do except wait.