use patch for updating content with an ink import

app/components/BookBuilder/Chapter/UploadButton.jsx

@@ -11,18 +11,17 @@ export class UploadButton extends React.Component {
     event.preventDefault()
 
     const file = event.target.files[0]
-    const {
-      chapter,
-      convertFile,
-      toggleUpload,
-      update
-    } = this.props
+    const { chapter, convertFile, toggleUpload, update } = this.props
 
     toggleUpload()
 
     convertFile(file).then(response => {
-      chapter.source = response.converted
-      update(chapter)
+      const patch = {
+        id: chapter.id,
+        source: response.converted
+      }
+
+      update(patch)
       toggleUpload()
     }).catch((error) => {
       console.error('INK error', error)