This diagrams show the typical flow for sending/receiving an asset between two rgb-lib wallets. Sending assets can be done in two ways. See the sections for the default and donation ways below for details.
These examples use NIA (fungible) assets but the same applies to UDA (non-fungible) assets as well.
You might also want to have a look at the similar flow for RGB protocol in general
Both ways to send assets share some initial steps, which are summarized in this diagram.This includes having some assets available for sending on the sender wallet. These can be issued by the wallet itself or received from another one.
The first way to send assets (donation=false) requires confirmation (ACK) from the receiver before the actual transfer happens. This is the default mode.
The second way to send assets (donation=true) is shorter and doesn't require the receiver's confirmation (ACK) but instead transfers the assets right away.