Here's why it's tricky to find a collective noun for "convey":
* Action, not a thing: "Convey" is a verb describing an action, not a noun representing a collection.
* Variety of meanings: "Convey" can be used for different things:
* Physical transport: (e.g., "The train conveyed the passengers.")
* Communication: (e.g., "Her words conveyed her disappointment.")
* Transfer of ownership: (e.g., "The will conveyed the property to her son.")
Instead of a collective noun, you could use phrases like:
* A series of messages
* A flow of information
* A stream of goods
* A fleet of vehicles
The best phrase depends on the context and what you want to convey.