diff --git a/submodules/TelegramCore/Sources/ChatHistoryImport.swift b/submodules/TelegramCore/Sources/ChatHistoryImport.swift
index 9f3fdb00bf..1ca297b9b6 100644
--- a/submodules/TelegramCore/Sources/ChatHistoryImport.swift
+++ b/submodules/TelegramCore/Sources/ChatHistoryImport.swift
@@ -104,7 +104,7 @@ public enum ChatHistoryImport {
     }
     
     public static func uploadMedia(account: Account, session: Session, file: TempBoxFile, fileName: String, mimeType: String, type: MediaType) -> Signal<Float, UploadMediaError> {
-        return multipartUpload(network: account.network, postbox: account.postbox, source: .tempFile(file), encrypt: false, tag: nil, hintFileSize: nil, hintFileIsLarge: false, useLargerParts: true)
+        return multipartUpload(network: account.network, postbox: account.postbox, source: .tempFile(file), encrypt: false, tag: nil, hintFileSize: nil, hintFileIsLarge: false, useLargerParts: true, useMultiplexedRequests: true)
         |> mapError { _ -> UploadMediaError in
             return .generic
         }
diff --git a/submodules/TelegramCore/Sources/Download.swift b/submodules/TelegramCore/Sources/Download.swift
index e9b2e207f8..00d4108fd2 100644
--- a/submodules/TelegramCore/Sources/Download.swift
+++ b/submodules/TelegramCore/Sources/Download.swift
@@ -82,6 +82,33 @@ class Download: NSObject, MTRequestMessageServiceDelegate {
         self.context.authTokenForDatacenter(withIdRequired: self.datacenterId, authToken:self.mtProto.requiredAuthToken, masterDatacenterId: self.mtProto.authTokenMasterDatacenterId)
     }
     
+    static func uploadPart(multiplexedManager: MultiplexedRequestManager, datacenterId: Int, consumerId: Int64, tag: MediaResourceFetchTag?, fileId: Int64, index: Int, data: Data, asBigPart: Bool, bigTotalParts: Int? = nil) -> Signal<Void, UploadPartError> {
+        let saveFilePart: (FunctionDescription, Buffer, DeserializeFunctionResponse<Api.Bool>)
+        if asBigPart {
+            let totalParts: Int32
+            if let bigTotalParts = bigTotalParts {
+                totalParts = Int32(bigTotalParts)
+            } else {
+                totalParts = -1
+            }
+            saveFilePart = Api.functions.upload.saveBigFilePart(fileId: fileId, filePart: Int32(index), fileTotalParts: totalParts, bytes: Buffer(data: data))
+        } else {
+            saveFilePart = Api.functions.upload.saveFilePart(fileId: fileId, filePart: Int32(index), bytes: Buffer(data: data))
+        }
+        
+        return multiplexedManager.request(to: .main(datacenterId), consumerId: consumerId, data: saveFilePart, tag: tag, continueInBackground: true)
+        |> mapError { error -> UploadPartError in
+            if error.errorCode == 400 {
+                return .invalidMedia
+            } else {
+               return .generic
+            }
+        }
+        |> mapToSignal { _ -> Signal<Void, UploadPartError> in
+            return .complete()
+        }
+    }
+    
     func uploadPart(fileId: Int64, index: Int, data: Data, asBigPart: Bool, bigTotalParts: Int? = nil) -> Signal<Void, UploadPartError> {
         return Signal<Void, MTRpcError> { subscriber in
             let request = MTRequest()
diff --git a/submodules/TelegramCore/Sources/MultipartUpload.swift b/submodules/TelegramCore/Sources/MultipartUpload.swift
index 441a771ac6..1b788b37ec 100644
--- a/submodules/TelegramCore/Sources/MultipartUpload.swift
+++ b/submodules/TelegramCore/Sources/MultipartUpload.swift
@@ -117,6 +117,7 @@ private final class MultipartUploadManager {
     var defaultPartSize: Int
     var bigTotalParts: Int?
     var bigParts: Bool
+    private let useLargerParts: Bool
     
     let queue = Queue()
     let fileId: Int64
@@ -145,6 +146,8 @@ private final class MultipartUploadManager {
         arc4random_buf(&fileId, 8)
         self.fileId = fileId
         
+        self.useLargerParts = useLargerParts
+        
         self.state = MultipartUploadState(encryptionKey: encryptionKey)
         
         self.committedOffset = 0
@@ -168,7 +171,7 @@ private final class MultipartUploadManager {
             self.bigParts = true
         } else if useLargerParts {
             self.bigParts = false
-            self.defaultPartSize = 64 * 1024
+            self.defaultPartSize = 128 * 1024
             self.bigTotalParts = nil
         } else {
             self.bigParts = false
@@ -206,7 +209,11 @@ private final class MultipartUploadManager {
                     self.bigParts = true
                 } else {
                     self.bigParts = false
-                    self.defaultPartSize = 16 * 1024
+                    if self.useLargerParts {
+                        self.defaultPartSize = 128 * 1024
+                    } else {
+                        self.defaultPartSize = 16 * 1024
+                    }
                     self.bigTotalParts = nil
                 }
             }
@@ -372,9 +379,24 @@ enum MultipartUploadError {
     case generic
 }
 
-func multipartUpload(network: Network, postbox: Postbox, source: MultipartUploadSource, encrypt: Bool, tag: MediaResourceFetchTag?, hintFileSize: Int?, hintFileIsLarge: Bool, useLargerParts: Bool = false) -> Signal<MultipartUploadResult, MultipartUploadError> {
-    return network.upload(tag: tag)
-    |> mapToSignalPromotingError { download -> Signal<MultipartUploadResult, MultipartUploadError> in
+func multipartUpload(network: Network, postbox: Postbox, source: MultipartUploadSource, encrypt: Bool, tag: MediaResourceFetchTag?, hintFileSize: Int?, hintFileIsLarge: Bool, useLargerParts: Bool = false, useMultiplexedRequests: Bool = false) -> Signal<MultipartUploadResult, MultipartUploadError> {
+    enum UploadInterface {
+        case download(Download)
+        case multiplexed(manager: MultiplexedRequestManager, datacenterId: Int, consumerId: Int64)
+    }
+    
+    let uploadInterface: Signal<UploadInterface, NoError>
+    if useMultiplexedRequests {
+        uploadInterface = .single(.multiplexed(manager: network.multiplexedRequestManager, datacenterId: network.datacenterId, consumerId: arc4random64()))
+    } else {
+        uploadInterface = network.upload(tag: tag)
+        |> map { download -> UploadInterface in
+            return .download(download)
+        }
+    }
+    
+    return uploadInterface
+    |> mapToSignalPromotingError { uploadInterface -> Signal<MultipartUploadResult, MultipartUploadError> in
         return Signal { subscriber in
             var encryptionKey: SecretFileEncryptionKey?
             if encrypt {
@@ -424,7 +446,12 @@ func multipartUpload(network: Network, postbox: Postbox, source: MultipartUpload
             }
             
             let manager = MultipartUploadManager(headerSize: headerSize, data: dataSignal, encryptionKey: encryptionKey, hintFileSize: hintFileSize, hintFileIsLarge: hintFileIsLarge, useLargerParts: useLargerParts, uploadPart: { part in
-                return download.uploadPart(fileId: part.fileId, index: part.index, data: part.data, asBigPart: part.bigPart, bigTotalParts: part.bigTotalParts)
+                switch uploadInterface {
+                case let .download(download):
+                    return download.uploadPart(fileId: part.fileId, index: part.index, data: part.data, asBigPart: part.bigPart, bigTotalParts: part.bigTotalParts)
+                case let .multiplexed(multiplexed, datacenterId, consumerId):
+                    return Download.uploadPart(multiplexedManager: multiplexed, datacenterId: datacenterId, consumerId: consumerId, tag: nil, fileId: part.fileId, index: part.index, data: part.data, asBigPart: part.bigPart, bigTotalParts: part.bigTotalParts)
+                }
             }, progress: { progress in
                 subscriber.putNext(.progress(progress))
             }, completed: { result in