diff --git a/cloud/templates/cloud/cloud_main.html b/cloud/templates/cloud/cloud_main.html
index 6e5b655..3c5256d 100644
--- a/cloud/templates/cloud/cloud_main.html
+++ b/cloud/templates/cloud/cloud_main.html
@@ -133,6 +133,7 @@ a.disabled {
                     <div class="dropdown-menu dropdown-menu-right shadow animated--fade-in" aria-labelledby="dropdownMenuLink">
                       <div class="dropdown-header">Dateioptionen</div>                      
                       <a class="dropdown-item" href="javascript:moveFile({{file.pk}})">Verschieben</a>
+                      <a class="dropdown-item" href="javascript:replaceFile({{file.pk}})">Ersetzen</a>
                       <div class="dropdown-divider"></div>
                       <a class="dropdown-item text-danger" href="javascript:delDataFileObje({{file.pk}})" >Löschen</a>
                     </div>
@@ -247,6 +248,26 @@ a.disabled {
   </div>
 </div>
 
+<!-- SelfFile ERROR -->
+<div class="modal fade" id="replaceerrModal" tabindex="-1" role="dialog" data-backdrop="static" aria-labelledby="groupDelFunction" aria-hidden="true">
+  <div class="modal-dialog " role="document">
+    <div class="modal-content">
+      <div class="modal-header">
+        <h5 class="modal-title" id="exampleModalLongTitle">Ersetzungsfehler</h5>
+        <button type="button" class="close" data-dismiss="modal" aria-label="Schließen">
+          <span aria-hidden="true">&times;</span>
+        </button>
+      </div>
+      <div class="modal-body">        
+        Sie können die Datei nicht mit sich selbst ersetzen.
+      </div>
+      <div class="modal-footer">        
+        <button type="button" class="btn btn-success" data-dismiss="modal">Schließen</button>
+      </div>
+    </div>
+  </div>
+</div>
+
 <!-- CONFIRMA DELETE FILE -->
 <div class="modal fade" id="delDataFile" tabindex="-1" role="dialog" data-backdrop="static" aria-labelledby="groupDelFunction" aria-hidden="true">
   <div class="modal-dialog " role="document">
@@ -259,6 +280,7 @@ a.disabled {
       </div>
       <div class="modal-body">        
         Datei <b><span id="filenametodel"></span></b> wirklich löschen?
+        <div id="connectedStandards"></div>
       </div>
       <div class="modal-footer">
         <button type="button" class="btn btn-danger" data-dismiss="modal" onclick="javascript:doDelDataFile()">Löschen</button>&nbsp;&nbsp;
@@ -268,6 +290,47 @@ a.disabled {
   </div>
 </div>
 
+
+<!-- CONFIRMA REPLACE FILE -->
+<div class="modal fade" id="replaceFileModal" tabindex="-1" role="dialog" data-backdrop="static" aria-labelledby="groupDelFunction" aria-hidden="true">
+  <div class="modal-dialog" role="document">
+    <div class="modal-content">
+      <div class="modal-header">
+        <h5 class="modal-title" id="exampleModalLongTitle">Datei ersetzen</h5>
+        <button type="button" class="close" data-dismiss="modal" aria-label="Schließen">
+          <span aria-hidden="true">&times;</span>
+        </button>
+      </div>
+      <div class="modal-body">        
+        Datei <b><span id="filenametodel"></span></b> ersetzen mit: 
+        <div class="input-group mb-3">
+            <input class="form-control searchuserfieldstask" list="possfiles" id="searchfiles" type="text" onkeyup="javascript:updateLinkedFiles()" >
+            <div class="input-group-append">            
+              <button type="button" onclick="javascript:clearSearchfieldAddFile()" class="btn btn-secondary" ><i class="fas fa-times"></i></button>
+            </div>
+              <datalist id="possfiles">
+                {% for f in files %}            
+                <option id="file_{{f.pk}}" value="{{f.name}}">{{f.name}}</option>            
+                {% endfor %}
+              </datalist>        
+          </div>
+          <div><span id="choosenfilename"></span></div>
+
+        <div id="connectedStandardsReplace"></div>
+        <hr>
+        <button id="btnDoReplaceFile" type="button" style="float: right" class="btn btn-secondary mt-1 " data-dismiss="modal" onclick="javascript:doreplaceFile(1)" disabled="true">Ersetzen, Alte Datei löschen!</button>
+      </div>      
+      <div class="modal-footer" >                
+        &nbsp;&nbsp;          
+          <button id="btnDoReplaceFileSnd" type="button" class="btn btn-danger" data-dismiss="modal" onclick="javascript:doreplaceFile(0)" disabled="true">Ersetzen, Alte Datei <u>nicht</u> löschen!</button>&nbsp;&nbsp;
+        <button type="button" class="btn btn-success" data-dismiss="modal">Abbrechen</button>
+      </div>
+      </div>
+    </div>
+  </div>
+</div>
+
+
 <!-- CONFIRMA MOVE/DIR -->
 <div class="modal fade" id="moveDataModal" tabindex="-1" role="dialog" data-backdrop="static" aria-labelledby="groupDelFunction" aria-hidden="true">
   <div class="modal-dialog " role="document">
@@ -377,9 +440,26 @@ a.disabled {
 
 <script>
 
-
 var actquotasize = {{actquota}};
 
+var ua = window.navigator.userAgent;
+var isIE = /MSIE|Trident/.test(ua);
+if ( isIE ) {
+  //IE specific code goes here
+    setInterval(function()
+  {
+
+    if($('#replaceFileModal').is(':visible')){
+        console.log("HI!");
+        updateLinkedFiles();      
+    }
+
+    
+  },400);
+}
+
+
+
     $(document).ready(function(){     
       $('[data-toggle="popover"]').popover();  
     $(".toast").toast({
@@ -388,6 +468,28 @@ var actquotasize = {{actquota}};
         });
   });
 
+function clearSearchfieldAddFile(){
+  $("#searchfiles").val("");
+}
+
+var replace_file_id = "";
+$("#choosenfilename").html("");
+
+function updateLinkedFiles(){  
+  
+  
+  var g = $('#searchfiles').val();
+  var id = $('#possfiles').find('option[value="' + g + '"]').attr('id');
+  if(id != undefined && id.length > 0){  
+    replace_file_id = id.split("_")[1];
+    console.log(replace_file_id);
+    clearSearchfieldAddFile();        
+    $("#choosenfilename").html("<b>Neue Datei:&nbsp;</b>" + g);
+    $("#btnDoReplaceFile").prop("disabled", false);
+    $("#btnDoReplaceFileSnd").prop("disabled", false);
+  }
+}
+
 
 //GROUPS
 function showGroupChangeModal(tochangeid){
@@ -427,9 +529,7 @@ function changeGroup(groupid, value){
           dirid : workingdirid,
           value : value
         },
-        success: function( data ) 
-        { 
-        }
+        success: function( data ) {}
      });
 }
 
@@ -454,11 +554,75 @@ function moveFile(fileid)
           html = ['<ul id="simple_list"><li><i class="fa fa-folder"></i>&nbsp;<a href="javascript:targetParentToMove({{rootid}})"><b><u>Heimverzeichnis<u></b></a>'];
           createList(data["data"]["agencydirlist"], l);          
           $("#agencydirlist").html(html);
-
         }
      });
 } 
 
+function doreplaceFile(dodel){  
+  $.ajax(
+      {
+        type: "GET",
+        url: "{% url 'cloud-adddir' parentid %}",
+        data:{
+          action : "replacefile",
+          oldid : workingfileid,
+          newid : replace_file_id,
+          delold : dodel
+        },
+        success: function( data ) 
+        { 
+          if(data["data"]["success"]){
+            location.href = location.href;  
+          }
+          else{
+            $("#replaceFileModal").modal("toggle");
+            $('#replaceFileModal').on('hidden.bs.modal', function (e) {
+              $("#replaceerrModal").modal("toggle");
+            })
+          }
+          
+        }
+     });
+}
+
+//MOVING OPERATIONS
+function replaceFile(fileid)
+{
+
+  workingfileid = fileid;
+  workingdirid = false;
+  replace_file_id = "";
+  $("#choosenfilename").html("");
+  $("#btnDoReplaceFile").prop("disabled", true);  
+  $("#btnDoReplaceFileSnd").prop("disabled", true);  
+  $("#replaceFileModal").modal("toggle");
+   $.ajax(
+      {
+        type: "GET",
+        url: "{% url 'cloud-adddir' parentid %}",
+        data:{
+          action : "getname_file",
+          id : workingfileid
+        },
+        success: function( data ) 
+        {     
+            standardstring = "";
+            if(data["data"]["linked_standards"] != undefined && data["data"]["linked_standards"].length > 0){
+              standardstring = "<hr><b>Achtung!</b> Datei ist mit folgenden Standards verlinkt:<br />";
+            }            
+            for(i = 0; i < data["data"]["linked_standards"].length; i++){
+              standardstring += (i+1) + ". " + data["data"]["linked_standards"][i]['name'];
+              if((i+1)< data["data"]["linked_standards"].length){
+                standardstring += "<br />";
+              }
+            }
+            $("#connectedStandardsReplace").html(standardstring);
+        }
+     });
+} 
+
+
+
 
 var html = ['<ul id="simple_list"><li><i class="fa fa-folder"></i>&nbsp;<a href="javascript:targetParentToMove({{rootid}})"><b><u>Heimverzeichnis<u></b></a>'];
 
@@ -647,9 +811,20 @@ function delDataFileObje(fileid){
           id : workingfileid
         },
         success: function( data ) 
-        {           
-              $("#filenametodel").html("");
-              $("#filenametodel").html(data["data"]["filename"]);
+        {     
+            standardstring = "";
+            if(data["data"]["linked_standards"] != undefined && data["data"]["linked_standards"].length > 0){
+              standardstring = "<hr><b>Achtung!</b> Datei ist mit folgenden Standards verlinkt:<br />";
+            }            
+            for(i = 0; i < data["data"]["linked_standards"].length; i++){
+              standardstring += (i+1) + ". " + data["data"]["linked_standards"][i]['name'];
+              if((i+1)< data["data"]["linked_standards"].length){
+                standardstring += "<br />";
+              }
+            }
+            $("#connectedStandards").html(standardstring);
+            $("#filenametodel").html("");
+            $("#filenametodel").html(data["data"]["filename"]);
         }
      });
 }
diff --git a/cloud/views.py b/cloud/views.py
index 82a01f2..5db8fbf 100644
--- a/cloud/views.py
+++ b/cloud/views.py
@@ -17,7 +17,8 @@ from datetime import datetime
 from users.models import AgencyGroup
 from django.conf import settings
 from django.http import FileResponse
-
+from standards.models import Standards 
+from django.contrib import messages
 '''
 
 	Prüft, ob ein Nutzer in diesen Ordner Zugriffsrechte hat. Läuft den gesamten Strang bis nach oben,
@@ -150,7 +151,14 @@ def adddirbyajax(request, parent):
 		# RETURN FILENAME
 		elif(request.GET.get("action") == "getname_file"):
 			fileobj = DataFile.objects.get(pk=request.GET.get('id'), agency=request.user.profile.agency)
-			data = {'filename' : fileobj.name}
+
+			linked_standards = Standards.objects.filter(agency=request.user.profile.agency);
+			linked_standards_final = []
+			for ls in linked_standards:
+				if(fileobj in ls.addedfiles.all()):
+					linked_standards_final.append({ "id" : ls.pk, "name" : ls.name });			
+			data = {'filename' : fileobj.name, 'linked_standards' : linked_standards_final}
+
 		# DELETE FILE
 		elif(request.GET.get("action") == "del_file"):
 			DataFile.objects.filter(pk=request.GET.get('id'), agency=request.user.profile.agency).delete()
@@ -188,14 +196,39 @@ def adddirbyajax(request, parent):
 		
 		elif(request.GET.get("action") == "getgroupsofdir"):	
 			dirid = request.GET.get('dirid')
-			allgroupsofdir = DataDir.objects.get(pk=dirid, agency=request.user.profile.agency).visibleby.all()
-			
+			allgroupsofdir = DataDir.objects.get(pk=dirid, agency=request.user.profile.agency).visibleby.all()			
 			grouopsid = []
 			for ag in allgroupsofdir:
-				grouopsid.append({"id" : ag.pk})
-			
+				grouopsid.append({"id" : ag.pk})			
 			data = {"gdir" : grouopsid}	
 
+		# REPLACE FILE
+		elif(request.GET.get("action") == "replacefile"):
+			oldid = DataFile.objects.get(pk=request.GET.get('oldid'), agency=request.user.profile.agency)
+			newid = DataFile.objects.get(pk=request.GET.get('newid'), agency=request.user.profile.agency)
+			if(oldid != None and newid != None and oldid != newid):
+				
+				linked_standards = Standards.objects.filter(agency=request.user.profile.agency);
+				replacecounter = 0
+				for standard in linked_standards:
+					if(oldid in standard.addedfiles.all()):						
+						standard.addedfiles.remove(oldid)
+						standard.addedfiles.add(newid)
+						standard.save()
+						replacecounter += 1
+
+				if(request.GET.get('delold') == "1"):
+					oldid.delete()
+
+				data = {"success" : True}
+				if(replacecounter > 0):
+					if(replacecounter == 1):
+						messages.success(request, f'Datei wurde in einem Standard ersetzt.')		
+					else:
+						messages.success(request, f'Datei wurde in '+str(replacecounter)+' Standards ersetzt.')		
+			else:
+				data = {"success" : False}
+
 	elif request.method == 'POST':
 		tempdir = False		
 		tempdir = DataDir.objects.get(pk=parent)
diff --git a/standards/templates/standards/standards_add.html b/standards/templates/standards/standards_add.html
index 01c11d9..76c488c 100644
--- a/standards/templates/standards/standards_add.html
+++ b/standards/templates/standards/standards_add.html
@@ -327,6 +327,8 @@ if ( isIE ) {
   {
     alluserfields = $(".searchuserfieldstask").each(function(key, value){
       specific_userfield_id = value['id'].split("_")[1];
+      updateLinkedStandards();
+      updateLinkedFiles();
       checkUserVerant();
       checkUserEx();
       checkUserVer();
@@ -334,20 +336,6 @@ if ( isIE ) {
   },400);
 }
 
-var ua = window.navigator.userAgent;
-var isIE = /MSIE|Trident/.test(ua);
-if ( isIE ) {
-  //IE specific code goes here
-    setInterval(function()
-  {
-    alluserfields = $(".searchuserfieldstask").each(function(key, value){
-      specific_userfield_id = value['id'].split("_")[1];
-      updateLinkedStandards();
-      updateLinkedFiles();
-    });     
-  },400);
-}
-
 //USERSTOSTANDARDS
 //Verantwortlicher
 act_verant = [];