would like to be able to select messages in the Thunderbird GUI and then action them for further processing. An example of a process would be to print the selected messages to a single .pdf file. I have tried to select two files and print them to .pdf, however each message produces its own .pdf file. Is there a simple process to select desired messages from the GUI and print them to a single .pdf file? Solutions that use native functionality are preferred. Add-ons are also welcomed. Thank you