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MailMerge is improving each time ! However, since last time I used it with personnalized attachments, I moved to MacOS. I can't find the way to give the right path to the files and have it attached to the mails generated

Cette critique concerne une version précédente du module (9.1.0). 

You must select the files manually in the field "Attachments -> File" in the Mail Merge Dialog. Then specify the filename in the field "Attachments -> Attachments". See:
https://addons.thunderbird.net/thunderbird/addon/mail-merge/versions/9.0.0