On Windows devices Bria should be able to install the "npcap" tools necessary for the Packet Capture feature by itself, but on macOS the equivalent libraries may need to be installed through Wireshark or manually installed.
If you have any issues utilizing Bria's built-in packet capture tools please try installing Wireshark from the link below:
And if this is not effective, try running the following from Terminal
brew cask install wireshark-chmodbpf