Todo listo para añadir la funcionalidad de escoger archivo

lib/widget/action_button.dart

 import 'package:flutter/material.dart';
 
 class ActionButton extends StatelessWidget {
-  final actionButtonTypes tipoBoton;
+  final ActionButtonTypes tipoBoton;
   final VoidCallback? onPressed;
 
 
-  const ActionButton({super.key, required this.onPressed,
-                      required this.label, required this.icon});
+  ActionButton({super.key, required this.tipoBoton, required this.onPressed});
 
   @override
   Widget build(BuildContext context) {
@@ -14,24 +13,24 @@ class ActionButton extends StatelessWidget {
       textDirection: TextDirection.rtl,
       child: FilledButton.icon(
           onPressed: onPressed,
-          label: Text(label, textScaler: const TextScaler.linear(1.2)),
-          icon: icon,
+          label: Text(tipoBoton.label, textScaler: const TextScaler.linear(1.2)),
+          icon: tipoBoton.icon,
       ),
     );
   }
 }
 
 
-enum actionButtonTypes {
-  ARCHIVO('Archivo', Icon(Icons.description_outlined)),
-  CARPETA('Carpeta', Icon(Icons.folder_outlined)),
-  ENLACE('Enlace', Icon(Icons.link_outlined)),
-  COPIAR('Copiar', Icon(Icons.copy)),
-  COMPRIMIR('Comprimir', Icon(Icons.splitscreen_outlined)),
-  REEMPLAZAR('Reemplazar', Icon(Icons.change_circle_outlined));
+enum ActionButtonTypes {
+  archivo('Archivo', Icon(Icons.description_outlined)),
+  carpeta('Carpeta', Icon(Icons.folder_outlined)),
+  enlace('Enlace', Icon(Icons.link_outlined)),
+  copiar('Copiar', Icon(Icons.copy)),
+  comprimir('Comprimir', Icon(Icons.splitscreen_outlined)),
+  reemplazar('Reemplazar', Icon(Icons.change_circle_outlined));
 
   final String label;
   final Icon icon;
 
-  const actionButtonTypes(this.label, this.icon);
+  const ActionButtonTypes(this.label, this.icon);
 }
\ No newline at end of file

lib/widget/convertex_fab_bar.dart

+import 'package:file_picker/file_picker.dart';
 import 'package:flutter/material.dart';
 
 import './action_button.dart';
@@ -51,6 +52,24 @@ class _ConVertexFabBarState extends State<ConVertexFabBar> {
     );
   }
 
+  List<Widget> _loadConvertirActionButtons (BuildContext context) {
+    final buttons = <Widget>[
+      ActionButton(
+        tipoBoton: ActionButtonTypes.copiar,
+        onPressed: () {},
+      ),
+      ActionButton(
+          tipoBoton: ActionButtonTypes.reemplazar,
+          onPressed: () {}
+      ),
+      ActionButton(
+          tipoBoton: ActionButtonTypes.comprimir,
+          onPressed: () {}
+      )
+    ];
+    return buttons;
+  }
+
   List<Widget> _buildFABs() {
     final toRet = <Widget>[];
 
@@ -83,13 +102,6 @@ class _ConVertexFabBarState extends State<ConVertexFabBar> {
       ],
     ));
 
-    List<Widget> _loadConvertirActionButtons(BuildContext context){
-      final buttons = <Widget>[];
-
-
-      return buttons;
-    }
-
 
     // FAB con las opciones para agregar archivos, carpetas, enlaces...
     toRet.add(Stack(
@@ -122,8 +134,27 @@ class _ConVertexFabBarState extends State<ConVertexFabBar> {
   }
 
   List<Widget> _loadAgregarActionButtons(BuildContext context){
-    final buttons = <Widget>[];
-
+    final buttons = <Widget>[
+      ActionButton(
+          tipoBoton: ActionButtonTypes.enlace,
+          onPressed: () {}
+      ),
+      ActionButton(
+          tipoBoton: ActionButtonTypes.carpeta,
+          onPressed: () {}
+      ),
+      ActionButton(
+        tipoBoton: ActionButtonTypes.archivo,
+        onPressed: () async {
+          FilePickerResult? result = await FilePicker.platform.pickFiles();
+          if (result != null) {
+            String filePath = result.files.single.path!;
+          } else {
+            //
+          }
+        },
+      ),
+    ];
     return buttons;
   }
 }