diff --git a/src/OpenFOAM/global/fileOperations/collatedFileOperation/OFstreamCollator.C b/src/OpenFOAM/global/fileOperations/collatedFileOperation/OFstreamCollator.C
index 3f4621f540..6ee4bb36a8 100644
--- a/src/OpenFOAM/global/fileOperations/collatedFileOperation/OFstreamCollator.C
+++ b/src/OpenFOAM/global/fileOperations/collatedFileOperation/OFstreamCollator.C
@@ -6,7 +6,7 @@
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
     Copyright (C) 2017-2018 OpenFOAM Foundation
-    Copyright (C) 2019-2022 OpenCFD Ltd.
+    Copyright (C) 2019-2023 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -361,10 +361,13 @@ bool Foam::OFstreamCollator::write
     off_t totalSize = 0;
     label maxLocalSize = 0;
     {
-        for (const label recvSize : recvSizes)
+        if (UPstream::master(localComm_))
         {
-            totalSize += recvSize;
-            maxLocalSize = max(maxLocalSize, recvSize);
+            for (const label recvSize : recvSizes)
+            {
+                totalSize += recvSize;
+                maxLocalSize = max(maxLocalSize, recvSize);
+            }
         }
         Pstream::broadcasts(localComm_, totalSize, maxLocalSize);
     }
diff --git a/tutorials/IO/fileHandler_dynamicCode/Allrun b/tutorials/IO/fileHandler_dynamicCode/Allrun
new file mode 100755
index 0000000000..e6d2620efd
--- /dev/null
+++ b/tutorials/IO/fileHandler_dynamicCode/Allrun
@@ -0,0 +1,17 @@
+#!/bin/sh
+cd "${0%/*}" || exit                                # Run from this directory
+. ${WM_PROJECT_DIR:?}/bin/tools/RunFunctions        # Tutorial run functions
+#------------------------------------------------------------------------------
+
+runApplication blockMesh
+
+application=$(getApplication)
+
+#- Test writing collated format
+#runApplication decomposePar -fileHandler collated
+runParallel redistributePar -decompose -fileHandler collated
+runParallel $application -fileHandler collated
+#runApplication reconstructPar -latestTime -fileHandler collated
+runParallel -s reconstruct redistributePar -reconstruct -fileHandler collated
+
+#------------------------------------------------------------------------------
diff --git a/tutorials/IO/fileHandler_dynamicCode/system/controlDict b/tutorials/IO/fileHandler_dynamicCode/system/controlDict
index 4d2efdabad..4e3afc109a 100644
--- a/tutorials/IO/fileHandler_dynamicCode/system/controlDict
+++ b/tutorials/IO/fileHandler_dynamicCode/system/controlDict
@@ -75,7 +75,7 @@ runTimeModifiable true;
 
 functions
 {
-    fileUpdate
+    solverControls
     {
         type                timeActivatedFileUpdate;
         libs                (utilityFunctionObjects);
@@ -90,6 +90,22 @@ functions
         );
     }
 
+    fvSolution
+    {
+        type                timeActivatedFileUpdate;
+        libs                (utilityFunctionObjects);
+        writeControl        timeStep;
+        writeInterval       1;
+        fileToUpdate        "<system>/fvSolution";
+
+        timeVsFile
+        (
+            (-1     "<system>/fvSolution.0" )
+            ( 0.02  "<system>/fvSolution.5" )
+        );
+    }
+
+
     // Wait a bit to make runTimeModifiable work.
     //  - see also fileModificationSkew
     //  - could also directly use system FO
diff --git a/tutorials/IO/fileHandler_dynamicCode/system/fvSolution b/tutorials/IO/fileHandler_dynamicCode/system/fvSolution
index 059a9f375c..ddbf2bf3f9 100644
--- a/tutorials/IO/fileHandler_dynamicCode/system/fvSolution
+++ b/tutorials/IO/fileHandler_dynamicCode/system/fvSolution
@@ -18,8 +18,8 @@ solvers
 {
     p
     {
-        solver          PCG;
-        preconditioner  DIC;
+        solver          GAMG;
+        smoother        symGaussSeidel;
         tolerance       1e-06;
         relTol          0.05;
     }
diff --git a/tutorials/IO/fileHandler_dynamicCode/system/fvSolution.0 b/tutorials/IO/fileHandler_dynamicCode/system/fvSolution.0
new file mode 100644
index 0000000000..059a9f375c
--- /dev/null
+++ b/tutorials/IO/fileHandler_dynamicCode/system/fvSolution.0
@@ -0,0 +1,51 @@
+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:  v2312                                 |
+|   \\  /    A nd           | Website:  www.openfoam.com                      |
+|    \\/     M anipulation  |                                                 |
+\*---------------------------------------------------------------------------*/
+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       dictionary;
+    object      fvSolution;
+}
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+solvers
+{
+    p
+    {
+        solver          PCG;
+        preconditioner  DIC;
+        tolerance       1e-06;
+        relTol          0.05;
+    }
+
+    pFinal
+    {
+        $p;
+        relTol          0;
+    }
+
+    U
+    {
+        solver          smoothSolver;
+        smoother        symGaussSeidel;
+        tolerance       1e-05;
+        relTol          0;
+    }
+}
+
+PISO
+{
+    nCorrectors     2;
+    nNonOrthogonalCorrectors 0;
+    pRefCell        0;
+    pRefValue       0;
+}
+
+
+// ************************************************************************* //
diff --git a/tutorials/IO/fileHandler_dynamicCode/system/fvSolution.5 b/tutorials/IO/fileHandler_dynamicCode/system/fvSolution.5
new file mode 100644
index 0000000000..ddbf2bf3f9
--- /dev/null
+++ b/tutorials/IO/fileHandler_dynamicCode/system/fvSolution.5
@@ -0,0 +1,51 @@
+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:  v2312                                 |
+|   \\  /    A nd           | Website:  www.openfoam.com                      |
+|    \\/     M anipulation  |                                                 |
+\*---------------------------------------------------------------------------*/
+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       dictionary;
+    object      fvSolution;
+}
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+solvers
+{
+    p
+    {
+        solver          GAMG;
+        smoother        symGaussSeidel;
+        tolerance       1e-06;
+        relTol          0.05;
+    }
+
+    pFinal
+    {
+        $p;
+        relTol          0;
+    }
+
+    U
+    {
+        solver          smoothSolver;
+        smoother        symGaussSeidel;
+        tolerance       1e-05;
+        relTol          0;
+    }
+}
+
+PISO
+{
+    nCorrectors     2;
+    nNonOrthogonalCorrectors 0;
+    pRefCell        0;
+    pRefValue       0;
+}
+
+
+// ************************************************************************* //