Also to point out, since mentioning the security aspect, any file/attachment/etc uploaded to AirTable are 100% open and unsecured as long as you can obtain the

Also to point out, since mentioning the security aspect, any file/attachment/etc uploaded to AirTable are 100% open and unsecured as long as you can obtain the URL from any AirTable spreadsheet. They don't have a concept of authentication in regards to any files you've uploaded, regardless of your plan.