Fix build

Author: captainsafia

src/Components/Endpoints/src/FormMapping/Metadata/FormDataMetadataFactory.cs

@@ -17,7 +17,7 @@ internal partial class FormDataMetadataFactory(List<IFormDataConverterFactory> f
     private readonly FormMetadataContext _context = new();
     private readonly ParsableConverterFactory _parsableFactory = factories.OfType<ParsableConverterFactory>().Single();
     private readonly DictionaryConverterFactory _dictionaryFactory = factories.OfType<DictionaryConverterFactory>().Single();
-    private readonly FileConverterFactory? _fileConverterFactory = factories.OfType<FileConverterFactory>().SingleOrDefault();
+    private readonly FileConverterFactory _fileConverterFactory = factories.OfType<FileConverterFactory>().Single();
     private readonly CollectionConverterFactory _collectionFactory = factories.OfType<CollectionConverterFactory>().Single();
     private readonly ILogger<FormDataMetadataFactory> _logger = loggerFactory.CreateLogger<FormDataMetadataFactory>();
 
@@ -87,6 +87,12 @@ internal partial class FormDataMetadataFactory(List<IFormDataConverterFactory> f
                     return result;
                 }
 
+                if (_fileConverterFactory.CanConvert(type, options))
+                {
+                    result.Kind = FormDataTypeKind.File;
+                    return result;
+                }
+
                 if (_dictionaryFactory.CanConvert(type, options))
                 {
                     Log.DictionaryType(_logger, type);