Questions Regarding List Uploads and External Cleaners

Hello Guys :)
I hope you all are fine and having good days.
I have 2 Questions to know.
1. When we try List Uploads via TXT files then does that file stays in server?
i tried to find that in whole directory but the file does not stay in server for future reference.
It would be good and helpful for me to find that Original Upload File in Server.

2. Another Question is for those who used Cleaning services in Mailwizz.
How does that Work in Customer Section?
Screenshots would be helpful to understand clearly.

Thanks :)