Fix save issue

state/state.ts

     },
 
     forceSave(data) {
-      // storage.saveToLocalStorage(data)
       storage.saveToFileSystem(data)
     },
 

state/storage.ts

 
   saveAsToFileSystem = (data: Data) => {
     // Create a new document id when saving to the file system
+
     this.saveToFileSystem(data, uuid())
   }
 
-  saveToFileSystem = (data: Data, id = data.document.id) => {
+  saveToFileSystem = (data: Data, id?: string) => {
     // Save to local storage first
     this.saveToLocalStorage(data, id)
 
     fa.fileSave(
       blob,
       {
-        fileName: `${data.document.name}.tldr`,
+        fileName: `${
+          id
+            ? data.document.name
+            : this.previousSaveHandle?.name || 'My Document'
+        }.tldr`,
         description: 'tldraw file',
         extensions: ['.tldr'],
       },
-      this.previousSaveHandle,
+      id ? undefined : this.previousSaveHandle,
       true
     )
       .then((handle) => {