diff --git a/AicsKnowledgeBase_file/Controllers/FileController.cs b/AicsKnowledgeBase_file/Controllers/FileController.cs
index cb43b03..1c8bed2 100644
--- a/AicsKnowledgeBase_file/Controllers/FileController.cs
+++ b/AicsKnowledgeBase_file/Controllers/FileController.cs
@@ -19,9 +19,10 @@ public class FileController : ControllerBase {
     public async Task<IActionResult> GetFileStatus(string fileId) {
         try {
             var metadata = await _knowledgeFileHandler.GetFileMetadata(fileId);
-            var existingRanges = await _knowledgeFileHandler.GetAllPartFileRanges(fileId);
+            var existingRanges = (await _knowledgeFileHandler.GetAllPartFileRanges(fileId))
+                .Select((range, _) => $"{range.Item1}-{range.Item2}");
 
-            return Ok(new FileStatus(metadata.IsCompleted, metadata.Md5, metadata.Size, existingRanges));
+            return Ok(new FileStatus(metadata.IsCompleted, metadata.Md5, metadata.Size, existingRanges.ToList()));
         } catch (FileNotFoundException) {
             return NotFound();
         }
@@ -83,5 +84,5 @@ internal record FileStatus(
     bool IsCompleted,
     string Md5,
     ulong Size,
-    List<Tuple<ulong, ulong>> ExistingRanges
+    List<string> ExistingRanges
 );
\ No newline at end of file
diff --git a/AicsKnowledgeBase_file/Handlers/KnowledgeFileHandler.cs b/AicsKnowledgeBase_file/Handlers/KnowledgeFileHandler.cs
index 3c981e5..27c9381 100644
--- a/AicsKnowledgeBase_file/Handlers/KnowledgeFileHandler.cs
+++ b/AicsKnowledgeBase_file/Handlers/KnowledgeFileHandler.cs
@@ -20,11 +20,11 @@ public class KnowledgeFileHandler {
     }
 
     public async Task<string[]> GetAllPartFiles(string fileId) {
-        return Directory.GetFiles($"{FilePath}/{fileId}.part.*");
+        return Directory.GetFiles(FilePath, $"{fileId}.part.*");
     }
 
     public Tuple<ulong, ulong> ConvertPartFileNameToRange(string fileName) {
-        var range = fileName.Split('.')[2].Split('-');
+        var range = fileName.Split('.').Last().Split('-');
         return Tuple.Create(ulong.Parse(range[0]), ulong.Parse(range[1]));
     }
 
@@ -43,7 +43,8 @@ public class KnowledgeFileHandler {
     }
 
     public async Task SaveFileSlice(string fileId, IFormFile file, ulong rangeStart, ulong rangeEnd) {
-        await file.CopyToAsync(File.Create(GetSliceFileName(fileId, rangeStart, rangeEnd)));
+        await using var fileStream = File.Create(GetSliceFileName(fileId, rangeStart, rangeEnd));
+        await file.CopyToAsync(fileStream);
     }
 
     /// <exception cref="InvalidDataException">缺失分片时抛出，其Message内容是缺失分片的Range</exception>