This is the 7538th most frequent Russian word.
добавлены
"Added."
In this sentence, 'добавлены' is used in the past passive participle form to indicate that files were added (by someone or something) to a system.
Файлы успешно добавлены в систему.
The files have been successfully added to the system.
Here, 'добавлены' explains that new members were included in the list, focusing on the result of the adding action.
Новые участники были добавлены в список участников.
The new participants were added to the participant list.
This usage of 'добавлены' refers to changes being integrated into something as a result of an action taken previously.