UploadProgressCallback

```
public interface UploadProgressCallback

                    
```
Native-bridge progress sink for SessionBridge.uploadAttachment.
Threading. Fires on a Rust worker thread; the JNI bridge attaches the thread to the JVM via AttachCurrentThreadAsDaemon before invoking onProgress. Implementations must not touch UI state directly — dispatch to the main thread (or use the higher-level OrigonClient.uploadAttachment which exposes a coroutine Flow).
ABI-locked. The Rust JNI bridge looks up onProgress by name with signature (JJ)V. Don't rename or change the parameter types.

Method Summary

Modifier and Type	Method	Description
`abstract Unit`	`onProgress(Long uploaded, Long total)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - onProgress
```
 abstract Unit onProgress(Long uploaded, Long total)
```
    Parameters:
    
    uploaded - bytes transferred so far.
    
    total - total bytes expected, or -1 when unknown.