With the release of the Publication Space release, Transmittals have taken a back seat.
On iTWOcx projects that are using the Register for their document management, Transmittals were the core feature around which all things related to your document's revolved.
Now, the Transmittals (TX), while still generated in the background when any action is taken on the Publication Space, they are more of a record-keeping tool than what is used to interact with the Document Management process in the Publication Space.
How to view your Transmittals
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Export as PDF - lets you export the transmittal as a PDF file for offline access.
Hide the split button from Transmittals and Distribution Transmittals
This can be found on the Publication Space > Settings tab
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