Assistant cannot analyze large files

Hello, I have some files that are related to each other.I ask a short clear question in the chat.When I write the files with @, it gives the error “the file is to large to be sent.The file is too large to be sent”.Even if I write one file name, this error appears.Yes, some file lines are high (7. 500 lines) but the assistant thinks the file as if I am uploading it to him. However, doesn't the assistant mapping the project files with the “codebase context index”? I like your assistant more, it works more logically. But there is no this problem in a known assistant application.