How configure a second iCloud-drive (other Apple-id) on a iPad?

[iMore Question]

I would like to connect to my private iCloud-drive from my work iPad.
The work iPad is configured with my work Apple-id.

I tried to use the browser option, and ask for desktop version, conncect with my private Apple-id and place a icon on the beginscreen. So far so good.

But next time I open the private iCloud-drive it shows me the iCloud-startup screen to connect Icloud drive, search iPhone and connect friends.

How to keep the ICloud-drive connection.

Thank you