Resolved Template fields not being identified.

Hi,

I installed today the RO CSVI because I need to import about 470 users.

My first problem is the message The list of available fields is out-of-date for extension com_content. Update the list to ensure you have all fields available.
I understood it is used for custom fields. When I click update, the new page shows updating, but in fact, it hangs until I get the 506 error message.

My next problem is that I have the following header in my CSV file:
email name usergroupName Password username

But when I try to create the fields for my Template, under - Template Fields, it doesn't show the email field.

I followed the tutorial to import users, tried to use the Import User template and still, I can't add all the fields for the template.

RO CSVI version 9.4.1

Thank you for the help.