diff --git a/src/main/java/org/gcube/portlets/user/workspace/client/AppControllerExplorer.java b/src/main/java/org/gcube/portlets/user/workspace/client/AppControllerExplorer.java
index 09f8927..669773b 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/client/AppControllerExplorer.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/client/AppControllerExplorer.java
@@ -27,8 +27,6 @@ import org.gcube.portlets.user.workspace.client.event.CreateSharedFolderEvent;
 import org.gcube.portlets.user.workspace.client.event.CreateSharedFolderEventHandler;
 import org.gcube.portlets.user.workspace.client.event.CreateUrlEvent;
 import org.gcube.portlets.user.workspace.client.event.CreateUrlEventHandler;
-import org.gcube.portlets.user.workspace.client.event.DeleteBulkEvent;
-import org.gcube.portlets.user.workspace.client.event.DeleteBulkEventHandler;
 import org.gcube.portlets.user.workspace.client.event.DeleteItemEvent;
 import org.gcube.portlets.user.workspace.client.event.DeleteItemEventHandler;
 import org.gcube.portlets.user.workspace.client.event.DeleteMessageEvent;
@@ -1102,24 +1100,23 @@ public class AppControllerExplorer implements EventHandler, TreeAppControllerInt
 					@Override
 					public void onUploadCompleted(String parentId, String itemId) {
 						GWT.log("Upload completed: [parentID: "+parentId+", itemId: "+itemId+", uploadType: "+fileUploadEvent.getUploadType()+"]");
-						eventBus.fireEvent(new CompletedFileUploadEvent(parentId, itemId, fileUploadEvent.getUploadType()));
+						eventBus.fireEvent(new CompletedFileUploadEvent(parentId, itemId, fileUploadEvent.getUploadType(), false));
 					}
 					
 					@Override
 					public void onUploadAborted(String parentId, String itemId) {
 						GWT.log("Upload Aborted: [parentID: "+parentId+", itemId: "+itemId+"]");
-						
 					}
 					
 					@Override
 					public void onError(String parentId, String itemId, Throwable throwable) {
-						GWT.log("Upload Aborted: [parentID: "+parentId+", itemId: "+itemId+"]");
-						
+						GWT.log("Upload Error: [parentID: "+parentId+", itemId: "+itemId+"]");	
 					}
 
 					@Override
 					public void onOverwriteCompleted(String parentId, String itemId) {
 						GWT.log("Upload Override Completed: [parentID: "+parentId+", itemId: "+itemId+"]");
+						eventBus.fireEvent(new CompletedFileUploadEvent(parentId, itemId, fileUploadEvent.getUploadType(), true));
 					}
 				};
 				
@@ -1919,13 +1916,13 @@ public class AppControllerExplorer implements EventHandler, TreeAppControllerInt
 
 					CompletedFileUploadEvent fileUpEvent = (CompletedFileUploadEvent) event;
 
-					sub.addedFile(fileUpEvent.getItemIdentifier(), fileUpEvent.getParentId(), fileUpEvent.getUploadType());
+					sub.addedFile(fileUpEvent.getItemIdentifier(), fileUpEvent.getParentId(), fileUpEvent.getUploadType(), fileUpEvent.isOverwrite());
 
 				}else if(event instanceof CreateUrlEvent){
 
 					CreateUrlEvent createUrlEvent = (CreateUrlEvent) event;
 
-					sub.addedFile(createUrlEvent.getItemIdentifier(), createUrlEvent.getParentFileModel().getIdentifier(), WS_UPLOAD_TYPE.File);
+					sub.addedFile(createUrlEvent.getItemIdentifier(), createUrlEvent.getParentFileModel().getIdentifier(), WS_UPLOAD_TYPE.File, false);
 
 				}else if(event instanceof MoveItemEvent){
 
diff --git a/src/main/java/org/gcube/portlets/user/workspace/client/event/CompletedFileUploadEvent.java b/src/main/java/org/gcube/portlets/user/workspace/client/event/CompletedFileUploadEvent.java
index e041214..60b1ac0 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/client/event/CompletedFileUploadEvent.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/client/event/CompletedFileUploadEvent.java
@@ -6,34 +6,44 @@ import org.gcube.portlets.user.workspace.client.interfaces.GuiEventInterface;
 
 import com.google.gwt.event.shared.GwtEvent;
 
-
 /**
  * The Class CompletedFileUploadEvent.
  *
- * @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it
- * Oct 6, 2015
+ * @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it Oct 6, 2015
  */
-public class CompletedFileUploadEvent extends GwtEvent<CompletedFileUploadEventHandler> implements GuiEventInterface{
+public class CompletedFileUploadEvent extends
+		GwtEvent<CompletedFileUploadEventHandler> implements GuiEventInterface {
 	public static Type<CompletedFileUploadEventHandler> TYPE = new Type<CompletedFileUploadEventHandler>();
-	
+
 	private String itemIdentifier;
 	private String parentId;
+
+	/** The upload type. */
 	private WS_UPLOAD_TYPE uploadType;
+	private boolean isOverwrite;
 
 	/**
 	 * Instantiates a new completed file upload event.
 	 *
-	 * @param parentId the parent id
-	 * @param itemIdentifier the item identifier
-	 * @param uploadType the upload type
+	 * @param parentId
+	 *            the parent id
+	 * @param itemIdentifier
+	 *            the item identifier
+	 * @param uploadType
+	 *            the upload type
+	 * @param isOverwrite
 	 */
-	public CompletedFileUploadEvent(String parentId, String itemIdentifier, WS_UPLOAD_TYPE uploadType) {
+	public CompletedFileUploadEvent(String parentId, String itemIdentifier,
+			WS_UPLOAD_TYPE uploadType, boolean isOverwrite) {
 		this.parentId = parentId;
 		this.itemIdentifier = itemIdentifier;
 		this.uploadType = uploadType;
+		this.isOverwrite = isOverwrite;
 	}
 
-	/* (non-Javadoc)
+	/*
+	 * (non-Javadoc)
+	 * 
 	 * @see com.google.gwt.event.shared.GwtEvent#getAssociatedType()
 	 */
 	@Override
@@ -41,16 +51,24 @@ public class CompletedFileUploadEvent extends GwtEvent<CompletedFileUploadEventH
 		return TYPE;
 	}
 
-	/* (non-Javadoc)
-	 * @see com.google.gwt.event.shared.GwtEvent#dispatch(com.google.gwt.event.shared.EventHandler)
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * com.google.gwt.event.shared.GwtEvent#dispatch(com.google.gwt.event.shared
+	 * .EventHandler)
 	 */
 	@Override
 	protected void dispatch(CompletedFileUploadEventHandler handler) {
 		handler.onCompletedFileUploadEvent(this);
 	}
 
-	/* (non-Javadoc)
-	 * @see org.gcube.portlets.user.workspace.client.interfaces.GuiEventInterface#getKey()
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see
+	 * org.gcube.portlets.user.workspace.client.interfaces.GuiEventInterface
+	 * #getKey()
 	 */
 	@Override
 	public EventsTypeEnum getKey() {
@@ -78,7 +96,8 @@ public class CompletedFileUploadEvent extends GwtEvent<CompletedFileUploadEventH
 	/**
 	 * Sets the item identifier.
 	 *
-	 * @param itemIdentifier the itemIdentifier to set
+	 * @param itemIdentifier
+	 *            the itemIdentifier to set
 	 */
 	public void setItemIdentifier(String itemIdentifier) {
 		this.itemIdentifier = itemIdentifier;
@@ -87,17 +106,33 @@ public class CompletedFileUploadEvent extends GwtEvent<CompletedFileUploadEventH
 	/**
 	 * Sets the parent id.
 	 *
-	 * @param parentId the parentId to set
+	 * @param parentId
+	 *            the parentId to set
 	 */
 	public void setParentId(String parentId) {
 		this.parentId = parentId;
 	}
-	
+
 	/**
 	 * @return the uploadType
 	 */
 	public WS_UPLOAD_TYPE getUploadType() {
 		return uploadType;
 	}
-	
+
+	/**
+	 * @return the isOverwrite
+	 */
+	public boolean isOverwrite() {
+		return isOverwrite;
+	}
+
+	/**
+	 * @param isOverwrite
+	 *            the isOverwrite to set
+	 */
+	public void setOverwrite(boolean isOverwrite) {
+		this.isOverwrite = isOverwrite;
+	}
+
 }
diff --git a/src/main/java/org/gcube/portlets/user/workspace/client/interfaces/SubscriberInterface.java b/src/main/java/org/gcube/portlets/user/workspace/client/interfaces/SubscriberInterface.java
index 652d844..eac56f5 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/client/interfaces/SubscriberInterface.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/client/interfaces/SubscriberInterface.java
@@ -27,8 +27,9 @@ public interface SubscriberInterface {
 	 * @param itemIdentifier the item identifier
 	 * @param parentId the parent
 	 * @param file the file
+	 * @param isOverwrite 
 	 */
-	void addedFile(String itemIdentifier, String parentId, WS_UPLOAD_TYPE file);
+	void addedFile(String itemIdentifier, String parentId, WS_UPLOAD_TYPE file, boolean isOverwrite);
 
 	/**
 	 * Selected item.