diff --git a/contracts/v3/Hubv3.sol b/contracts/v3/Hubv3.sol
index 0b063f5..3f4f919 100644
--- a/contracts/v3/Hubv3.sol
+++ b/contracts/v3/Hubv3.sol
@@ -269,7 +269,7 @@ contract Hubv3 is AccessControlEnumerable, Initializable {
         bytes memory path,
         bytes calldata data
     ) external payable {
-        return db.upload(repoName, path, data);
+        return db.upload{value:msg.value}(repoName, path, data);
     }
 
     function uploadChunk(
@@ -278,7 +278,7 @@ contract Hubv3 is AccessControlEnumerable, Initializable {
         uint256  chunkId,
         bytes calldata data
     ) external payable {
-        return db.uploadChunk(repoName, path,chunkId, data);
+        return db.uploadChunk{value:msg.value}(repoName, path,chunkId, data);
     }
 
     function batchUpload(
diff --git a/contracts/v3/database/EthStorage/LargeStorageManagerV2.sol b/contracts/v3/database/EthStorage/LargeStorageManagerV2.sol
index 8896343..52aea97 100644
--- a/contracts/v3/database/EthStorage/LargeStorageManagerV2.sol
+++ b/contracts/v3/database/EthStorage/LargeStorageManagerV2.sol
@@ -22,12 +22,13 @@ contract LargeStorageManagerV2 {
     function _preparePut(bytes32 key, uint256 chunkId) private {
         bytes32 metadata = keyToMetadata[key][chunkId];
 
-        if (metadata == bytes32(0)) {
-            require(
-                chunkId == 0 || keyToMetadata[key][chunkId - 1] != bytes32(0x0),
-                "must replace or append"
-            );
-        }
+        // Remove the following code to support out-of-order upload chunks
+        // if (metadata == bytes32(0)) {
+        //     require(
+        //         chunkId == 0 || keyToMetadata[key][chunkId - 1] != bytes32(0x0),
+        //         "must replace or append"
+        //     );
+        // }
 
         if (!metadata.isInSlot()) {
             address addr = metadata.bytes32ToAddr();
diff --git a/contracts/v3/database/EthStorage/StorageHelperV2.sol b/contracts/v3/database/EthStorage/StorageHelperV2.sol
index f638e7c..448c315 100644
--- a/contracts/v3/database/EthStorage/StorageHelperV2.sol
+++ b/contracts/v3/database/EthStorage/StorageHelperV2.sol
@@ -5,6 +5,7 @@ import "./Memory.sol";
 import "./StorageSlotFactory.sol";
 
 library StorageHelperV2 {
+    uint256 public constant STORAGE_SLOT_CODE_V2_PREFIX_LEN = 280;
     // StorageSlotSelfDestructableV2 compiled via solc 0.8.7 optimized 200
     bytes internal constant STORAGE_SLOT_CODE_V2 =
         hex"6080604052348015600f57600080fd5b506004361060285760003560e01c80632b68b9c614602d575b600080fd5b60336035565b005b336001600160a01b037f0000000000000000000000000000000000000000000000000000000000000000161460965760405162461bcd60e51b81526020600482015260036024820152624e464f60e81b604482015260640160405180910390fd5b7f00000000000000000000000000000000000000000000000000000000000000006001600160a01b0316fffea2646970667358221220154417754813d1989858c876ab2ded2ba1aa380679fff7a4c8faea076ba020e664736f6c63430008070033";
diff --git a/contracts/v3/database/ethstorage.sol b/contracts/v3/database/ethstorage.sol
index 1456ce6..7a80126 100644
--- a/contracts/v3/database/ethstorage.sol
+++ b/contracts/v3/database/ethstorage.sol
@@ -57,7 +57,7 @@ contract ethstorage is LargeStorageManagerV2, database {
         bytes memory path,
         uint256 chunkId,
         bytes calldata data
-    ) external payable {
+    ) external payable override{
         _putChunkFromCalldata(
             keccak256(bytes.concat(repoName, "/", path)),
             chunkId,
diff --git a/test/v3-hub-test.js b/test/v3-hub-test.js
index 4c6e844..3f3c100 100644
--- a/test/v3-hub-test.js
+++ b/test/v3-hub-test.js
@@ -227,6 +227,37 @@ describe("Hub V3 Test", function () {
     expect(refs[0]).to.eql([data3, concatHexStr(repoName, key2)]);
   });
 
+  it("upload chunks", async function () {
+    const hubfacFac = await ethers.getContractFactory("HubFactory");
+    const hubFac = await hubfacFac.deploy(true);
+    await hubFac.deployed();
+
+    await hubFac.newHubImp();
+
+    expect(await hubFac.createHub(true)).to.emit(hubFac,"CreateHub");
+    let hub = await hubFac.hubs(0);
+    console.log(hub);
+    let git3 = await ethers.getContractAt("Hubv3",hub)
+
+    let chunk = Buffer.alloc(10 * 1024, Math.random(1024).toString());
+    console.log(chunk);
+    let chunk_1 = Buffer.alloc(5*1024)
+    let chunk_2 = Buffer.alloc(2*1024)
+    chunk.copy(chunk_1,0,0,5*1024)
+    chunk.copy(chunk_2,0,5*1024,7*1024)
+    expect(chunk.compare(chunk_1,0,5*1024,0,5*1024)).to.eq(0);
+    expect(chunk.compare(chunk_2,0,2*1024,5*1024,7*1024)).to.eq(0);
+    expect(chunk.length).to.eq(10 * 1024);
+
+
+
+    let tx = await git3.uploadChunk(Buffer.from("git3"),Buffer.from("git3/test") ,0,"0x"+chunk.toString("hex"),{value:ethers.utils.parseEther("1")})
+    let rec = await tx.wait();
+    console.log("Receipt:",rec)
+    let context = await git3.download(Buffer.from("git3"),Buffer.from("git3/test"))
+    expect(context[0]).to.equal("0x"+chunk.toString("hex"));
+  })
+
   it("HubFactory", async function () {
 
     const hubfacFac = await ethers.getContractFactory("HubFactory");