Fix

src/BUTR.CrashReportServer/Services/GZipCompressor.cs

@@ -28,6 +28,7 @@ public async Task<MemoryStream> CompressAsync(Stream decompressedStream, Cancell
         var compressedStream = _streamManager.GetStream();
         await using var zipStream = new GZipStream(compressedStream, CompressionMode.Compress, true);
         await decompressedStream.CopyToAsync(zipStream, ct);
+        compressedStream.Seek(0, SeekOrigin.Begin);
         return compressedStream;
     }