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src/Core/FileTime.Core/Models/IElement.cs

@@ -7,7 +7,7 @@ namespace FileTime.Core.Models
         bool IsSpecial { get; }
         string GetPrimaryAttributeText();
         Task<string> GetContent(CancellationToken token = default);
-        Task<long> GetElementSize(CancellationToken token = default);
+        Task<long?> GetElementSize(CancellationToken token = default);
 
         Task<IContentReader> GetContentReaderAsync();
         Task<IContentWriter> GetContentWriterAsync();