Importing .xlsx into Firebase

I created a functional app in AIStudio that could easily upload an .xlsx file, and using AI, correctly data map it even if the column headers on the .xlsx file were not perfectly formatted (which was the whole intent as I am trying to upload data from an old MS Access file). I had no choice but to move to Firebase and essentially recreate my app and I am stuck on the ‘Bulk Upload’ function. The AI couldn’t even correctly data map the .xlsx template the app generated it’s self (it had an example line). Any suggestions? This is my first design ‘project’ so I’m basically just grinding my way through it and have been stuck on this problem for 2 days now. Thanks.