Merging Multiple PDF via PowerAutomate

Hello, I am trying to merge files using the API.

I have a folder where the user places 3 or 4 files. We have named the files 01, 02, 03, 04 etc. but for some reason in the merge process the files get merged in a randow order. Any insight would be helpful.

I am using powerautomate. The files get submitted to a folder and then an email is sent which triggers. The files get put in an array and the api to call merge them.