Posting files on external links may deprive you from some answers because not all members can access external links.
The same for members wanting to follow the thread to learn something and cannot access external links.
Could you not create a small sample file showing what you have and expected results ( eventually) so it can be posted on the forum for all to access?
As you can see,max file sizes are clearly indicated in the " Manage attachments" wizard
screenshot-www msofficeforums com 2016-08-05 08-43-48.png

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Using O365 v2503 - Did you know you can thank someone who helped you? Click on the tiny scale in the right upper hand corner of your helper's post