Hi Expert,

I have added a inline visualforce page on case page layout. Now i am able to upload files perfectlry, but now i want to add loader or spiner on file upload time. I add a spiner in visualforce page but when uploading compleatd. then this move on case Tab with files list not on same page. 
 

<apex:page standardController="Case" extensions="UploadFileController" >
<apex:form >
<style type="text/css">
.bPageBlock .detailList .dataCol {
    width: 100%;
}

.bPageBlock .detailList .dataCol {
    width: 107%;
}


dataCol.first {
    text-align: center;
    }

  .detailList td.dataCol.first.last:nth-child(1) {
    text-align: right;
    width: 50%;
}
.inner-tab {
    padding: 20px 0px;
}
  </style>
  
 
 <apex:pageMessages />
 
 <apex:actionStatus id="pageStatus">
    <apex:facet name="start">
        <apex:outputPanel >
           <img src="/img/loading32.gif" width="50" height="50" />
           
            <apex:outputLabel value="Loading..." />
        </apex:outputPanel>            
    </apex:facet>
    
    <apex:facet name="stop">
         
    
    </apex:facet>
    
</apex:actionStatus>
 
<apex:pageBlock >




<apex:pageBlockSection id="sec1" rendered="{!sec1}"> 
    <apex:commandButton id="btnUpload"  action="{!Upload}" value="Upload File"  />
   
    <br/>
     <br/>
    <apex:pageBlock title="File Links" id="rerenderId">
    
      <apex:pageBlockTable value="{!listOfFiles}" var="fl" width="100%">
           <apex:column headerValue="URL" width="50%"><apex:outputLink target="_blank" value="{!fl.URL__c}">{!fl.Url}</apex:outputLink></apex:column>
           <apex:column headerValue="Created Date" width="20%" value="{!fl.createdDate}"></apex:column> 
      </apex:pageBlockTable>
    </apex:pageBlock>
  
    
</apex:pageBlockSection>


<div class="inner-tab">
<apex:pageBlockSection id="sec2" rendered="{!sec2}">
 <apex:inputFile value="{!AttchBody}" fileName="{!AttchName}" fileSize="{!AttachSize}"/>
 
 <apex:commandButton id="btnSubmit"  action="{!SubmitAttachment}" value="Submit Attachment"/>
</apex:pageBlockSection>
 </div>


</apex:pageBlock>





</apex:form>
 
  
</apex:page>

  

public with sharing class UploadFileController {

    Public Id RecordId {get;set;}
    public Blob AttchBody {get;set;}
    public String AttchDesc {get;set;}
    public String AttchName {get;set;}
    Public Integer AttachSize {get;set;}
    Public Attachment attch {get;set;}
    public boolean attachmentBtn {get; set;}
    public boolean sec1 {get;set;}
    public boolean sec2 {get;set;} 
    public External_File_Relationship__c fileDB; 
    public External_File__c ef;
    public List<String> fileList {get;set;} 
    public String parentId; 
    Public List<External_File__c>listOfFiles {get;set;}
     
  
     public UploadFileController(ApexPages.StandardController controller) {
        parentId = ((case)controller.getRecord()).id;
        sec1 = true;
        sec2 = false;
        
        RecordId = ApexPages.CurrentPage().getParameters().get('Id');
        init();

    }
    
    
    public PageReference SubmitAttachment(){
    
      if(AttchName != '' && AttchBody != NUll ){
      
      //file that is 25Mb or less
      if(AttachSize <= 25000000 ){
          External__c  extFile = new External__c();
          extFile.Name =  AttchName;
          extFile.CaseId__c = RecordId;
          
          Insert extFile ;
          attch = new Attachment(ParentId=extFile.id,Description=AttchDesc,Name=AttchName,Body=AttchBody);
       
         try{
                insert attch;
                
                system.debug('attch  '+attch);
                AttchBody = null;
                AttchDesc = null;
                AttchName = null;
               
            }
            catch(DMLException ex){
                    ApexPages.addMessage(new ApexPages.message(ApexPages.severity.ERROR,'Error uploading attachment'));
                    return null;
             
            }
            
            
            ApexPages.addMessage(new ApexPages.message(ApexPages.severity.INFO,'Attachment uploaded successfully'));
            
            string Attid= attch.id;
            string attachmentid=Attid.substring(0,15);
            String sfdcBaseURL = URL.getSalesforceBaseUrl().toExternalForm();
            extFile.File_Public_URL__c = sfdcBaseURL+'/servlet/servlet.FileDownload?file='+attachmentid;
            update extFile;
            sec2 = false;
            sec1 = true;
            init();
          
      }
      
      }else{
      
          ApexPages.addMessage(new ApexPages.message(ApexPages.severity.ERROR, AttchName +' is too large - please choose a file that is 25Mb or less'));
      
      }
        return null;
          
      }
      
      public void init(){
           List<External_File__c> lst = [Select URL__c, CreatedDate  from  External__c where CaseId__c =: RecordId];
           listOfFiles  = lst;
      }
      
     public PageReference Upload() {
       sec1 = false;
       sec2 = true;
       
       return null;
         
    
    }

}

when i add spinner or Loding then, this move to case tab with inline visualforce page.


Please suggest, what i am doing wrong

Regards
Mukesh