You can add or delete files to send from the Waiting screen.
Edit the list of files to send
1. Click 'Files' at the bottom of the Waiting screen.
2. To add files, click [+] icon to add files or drag and drop the files/folders you want to send.
To remove a file, click Trash can icon to the right of each file item.
3. When you are finished editing the list, click [V] to close the list.
4. Notify the other party when a new key is generated.