diff --git a/lib/getTemplate.ts b/lib/getTemplate.ts
index d77dbd6..ec4805b 100644
--- a/lib/getTemplate.ts
+++ b/lib/getTemplate.ts
@@ -187,17 +187,24 @@ function getTemplate(
     // @todo Array.isArray(schema.type)
     // -> hasDefault? return
     // if not -> pick first types
-
     if (!isJsonSchema(schema) || schema.type == null) {
         return undefined;
     }
 
+    // @attention - very special case to support file instances
+    if (data instanceof File) {
+        console.log("is file")
+        return data;
+    }
+
     const type = Array.isArray(schema.type)
         ? selectType(schema.type, data, schema.default)
         : schema.type;
 
     // reset invalid type
     const javascriptTypeOfData = getTypeOf(data);
+
+
     if (
         data != null &&
         javascriptTypeOfData !== type &&
diff --git a/test/unit/getTemplate.test.ts b/test/unit/getTemplate.test.ts
index 4f378db..59c1a08 100644
--- a/test/unit/getTemplate.test.ts
+++ b/test/unit/getTemplate.test.ts
@@ -1280,6 +1280,18 @@ describe("getTemplate", () => {
             expect({ list: [], author: "jane" }).to.deep.equal(template);
         });
 
+        describe("file", () => {
+            it("should not modify file-instance", () => {
+                const file = new File([], "testfile.pdf");
+                draft.setSchema({
+                    type: ["string", "object"],
+                    format: "file"
+                });
+                const res = getTemplate(draft, file, draft.getSchema());
+                expect(res).to.deep.equal(file);
+            });
+        });
+
 
         describe("extendDefaults", () => {