diff --git a/products/ASC.Files/Core/HttpHandlers/FileHandler.ashx.cs b/products/ASC.Files/Core/HttpHandlers/FileHandler.ashx.cs
index 1a293a4b65a..e50d1f428aa 100644
--- a/products/ASC.Files/Core/HttpHandlers/FileHandler.ashx.cs
+++ b/products/ASC.Files/Core/HttpHandlers/FileHandler.ashx.cs
@@ -289,7 +289,7 @@ private async ValueTask BulkDownloadFile(HttpContext context)
                     readStream.Seek(offset, SeekOrigin.Begin);
                 }
 
-                await SendStreamByChunksAsync(context, length, filename, readStream);
+                await SendStreamByChunksAsync(context, length, filename, readStream, false);
             }
 
             await context.Response.Body.FlushAsync();
@@ -490,7 +490,7 @@ private async Task DownloadFile<T>(HttpContext context, T id, bool forView)
                             }
                         }
 
-                        flushed = await SendStreamByChunksAsync(context, length, title, fileStream);
+                        flushed = await SendStreamByChunksAsync(context, length, title, fileStream, flushed);
                     }
                     else
                     {
@@ -513,7 +513,7 @@ private async Task DownloadFile<T>(HttpContext context, T id, bool forView)
                             fileStream.Seek(offset, SeekOrigin.Begin);
                         }
 
-                        flushed = await SendStreamByChunksAsync(context, length, title, fileStream);
+                        flushed = await SendStreamByChunksAsync(context, length, title, fileStream, flushed);
                     }
                 }
                 catch (ThreadAbortException tae)
@@ -609,7 +609,7 @@ private long ProcessRangeHeader(HttpContext context, long fullLength, ref long o
         return length;
     }
 
-    private async Task<bool> SendStreamByChunksAsync(HttpContext context, long toRead, string title, Stream fileStream)
+    private async Task<bool> SendStreamByChunksAsync(HttpContext context, long toRead, string title, Stream fileStream, bool flushed)
     {
         context.Response.Headers.Add("Connection", "Keep-Alive");
         context.Response.ContentLength = toRead;
@@ -618,7 +618,6 @@ private async Task<bool> SendStreamByChunksAsync(HttpContext context, long toRea
 
         var bufferSize = Convert.ToInt32(Math.Min(32 * 1024, toRead)); // 32KB
         var buffer = new byte[bufferSize];
-        var flushed = false;
         while (toRead > 0)
         {
             var length = await fileStream.ReadAsync(buffer, 0, bufferSize);
@@ -781,13 +780,15 @@ private async Task StreamFileAsync<T>(HttpContext context, T id)
                 return;
             }
 
-            long offset = 0;
-            var length = ProcessRangeHeader(context, file.ContentLength, ref offset);
+            context.Response.Headers.Add("Content-Disposition", ContentDispositionUtil.GetHeaderValue(file.Title));
+            context.Response.ContentType = MimeMapping.GetMimeMapping(file.Title);
 
             await using var stream = await fileDao.GetFileStreamAsync(file);
-            stream.Seek(offset, SeekOrigin.Begin);
-
-            await SendStreamByChunksAsync(context, length, file.Title, stream);
+            context.Response.Headers.Add("Content-Length",
+                stream.CanSeek
+                ? stream.Length.ToString(CultureInfo.InvariantCulture)
+                : file.ContentLength.ToString(CultureInfo.InvariantCulture));
+            await stream.CopyToAsync(context.Response.Body);
         }
         catch (Exception ex)
         {