Hi fei,

Firstly, I would like to sincerely apologize for the delayed response as we have been experiencing an unusually high number of tickets. I am sorry that it has taken longer than usual to respond to your concern and your patience is highly appreciated.

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1. If you do not wish to use a CSV as "from your WP Media Library" as the Data Source to be linked with a Table,

in that case you can try our "URL from any Domain" method.

Please check more here.

https://wpdatatables.com/documentation/creating-wpdatatables/creating-wpdatatables-from-csv/

But i am not sure if i understood what is your goal in the first question.

I wrote how you can link /synchronize the Table to an existing live CSV file,

but in case if you wish to import the source Data and make an editable Manual Table,

then please check this :

Creating editable tables by importing data from Excel, CSV or Google Spreadsheets.

2. Copying and Pasting a Range from a Spreadsheet :

Yes, you can do this only for Manual Tables with our Excel-Like Editor.

3.How to Add Data After Creating a Table :

You can either Edit the table, if you imported the Data,

then for existing Manual Tables, if you need to add a new updated file to update the Table, you can do this :

Update manual tables from source files (CSV, Excel or Google sheet).

4. Also, is changing the language of the settings a recognition that does not apply to many items on the management screen?

- Can you please elaborate more what you mean by this, i did not understand that one?

Thank you.

Let me know if that helps.