Add explicit drop on sender, log when finished consuming

src/upload.rs

@@ -169,6 +169,9 @@ where
 
             let _ = tx.send(res.map_err(Error::from)).await;
         }
+
+        drop(tx);
+        tracing::debug!("Finished consuming field");
     };
 
     let stream = ReceiverStream(rx);
@@ -234,6 +237,8 @@ where
         bytes.extend(b);
     }
 
+    tracing::debug!("Finished consuming field");
+
     if let Some(error) = error {
         return Err(error.into());
     }
@@ -382,6 +387,8 @@ where
         }
     }
 
+    tracing::debug!("Finished consuming multipart");
+
     if let Some(e) = provided_error {
         return Ok(Err(e));
     }