What do you mean by automatic file transfer? If you want to auto-accept all file transfers, check 'Automatically accept requests by default' in Preferences -> Instant Messages -> General Options.
If you want to share files to everybody via various commands, you can use Plus! File Sharing. For further information, read
this topic.
From version 3.60.144 it's also possible to send files automatically by dragging and dropping files on your conversation window.
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