Above the part of the screen you have cropped, is the text below. The ".tz" file is in the "Account Import" option, but must be renamed to "cpmove-USER.tar.gz" or it will not work. Replace "USER" with the name of the user of the transfer account.
Account Migration from cPanel
Account Migration Instructions
This feature will restore cPanel backups if in one of the following formats::
cpmove-{USER}.tar.gz
Example account test: cpmove-test.tar.gz
The files must be in one of the following directories on the server: /home
You must upload the file to one of the above directories before you can use this feature.
cPanel migration module will restore files from public_html folder, mysql databases and mysql users.
List of .tar.gz files in the /home folder