Welcome to the community, @Ricardo! 
None of your processes will need to change, but you simply won’t be able to use the formula field for your attachment extraction.
In Make.com, just point to the URL from the attachment field itself, download the file from that URL, and then attach that file to your email.
The URL will only be valid for 2 hours, but that won’t make a difference because it will only take a few seconds to download & attach the file. After 2 hours, if you try to grab a URL from that very same attachment field again, it will be a new URL, but that will be totally fine because you’re just downloading & attaching it again.
Hope this helps! If you’d like to hire the best Airtable consultant to help you with anything Airtable-related, please feel free to contact me through my website: Airtable consultant — ScottWorld