If you attempt to download a merged TLA from BBR, it only downloads the fragment of the session - not the entire merged session.

Thus, I would ask for a prompt when someone attempts to download a BBR viewed Merged Session. The popup could prompt: "This is a merged Tealeaf session. Do you wish to download a single unmerged session fragment, or the entire merged session?" Options would be a radio button to select from a list of session fragments loaded with their hit counts, timestamps. The last option would be to download the entire merged session as a single TLA.