Indirect object pronoun and direct object pronoun

Question

Why is this sentence je ferai parvenir le dossier à Jean dès que possible put the prounoun lui before ferai?

But Tuesday devrais prêter attention when ce qu'il dit put the pronoun between devrais and prêter?

Thanks for helping

Accepted Answer

Actually it would be "Je lui ferai parvenir le dossier." as Nicole says. I think the word order in the causative (faire + infinitive) is different from other modal verbs like devoir.
https://www.lawlessfrench.com/grammar/faire-causative-2/

Answer

Je ferai parvenir le dossier à Jean. -- I will get the file to Jean.Je ferai lui parvenir le dossier. -- I will get him the file.Lui replaces à Jean and moves to a position before the infinitive. There are strict rules governing word order in French. That's just how it is. Note that even in English, when you omitI don't know the second sentence you refer to. Can you post it?