Duplicate Multiple Steps Supported

This is an update about flow builder.

Before the update, you can duplicate only one step at a time. Now you can select multiple steps and duplicate them.

Please note that,

- after copying multiple steps, you can only paste once. copy again for another paste
- where can I paste the steps?
   (1) to the same bot/flow
   (2) to the different bot/flow but the same channel (associate custom fields will be created automatically)
   (3) to different channels (unsupported features will be removed)