Rust 为什么这个 Trait 无效以及改用什么签名

我有这个签名，我想在一个特征中使用它来创建许多适配器(文件系统、AWS、Google Cloud等).

我正在try 创建以下Trait个，但出现以下错误:

use tokio::io::AsyncRead;

#[async_trait::async_trait]
pub trait Trait: Send + Sync {
    async fn put_file<S>(&self, filename: &str, stream: S) -> Result<()>
    where
        S: AsyncRead + Send;
}

pub struct Client {
    location: String,
}

#[async_trait::async_trait]
impl Trait for Client {
    async fn put_file<S>(&self, filename: &str, stream: S) -> Result<()>
    where
        S: AsyncRead + Send,
    {
        futures::pin_mut!(stream);

        let path = Path::new(&self.location).join(filename);

        let mut file = BufWriter::new(File::create(path).await?);

        tokio::io::copy(&mut stream, &mut file).await?;

        Ok(())
    }
}

error[E0038]: the trait `Trait` cannot be made into an object
   |
23 |     pub client: Arc<dyn Trait>,
   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `Trait` cannot be made into an object
   |
note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
   |
5  | pub trait Trait: Send + Sync {
   |           ----- this trait cannot be made into an object...
6  |     async fn put_file<S>(&self, filename: &str, stream: S) -> Result<()>
   |              ^^^^^^^^ ...because method `put_file` has generic type parameters
   = help: consider moving `put_file` to another trait

为什么？