Hey! Want to learn how to implement this https://youtu.be/AZPdeZNQwO4?si=bmsls87QqsmX-2ap. Do I need to install git and npm?

Hey! So I may or may not be structuring this correctly, but here it goes. I have a form that people fill out as a sign up sheet. On the backend (grid) I want to be able to assign a region and a territory based on zip codes. Most states only have 1 region and territory. Some states (larger ones) have multiple territories; these states are the ones we look at zip codes for. How would I do this as an automation? If that's the way to do it?

Is there a way to calculate the combined file size of an attachment field? eg. I use an automation to send proofs but some fail as the combined files are over 25MB. I'd like to know in advance if possible.

Question about interface functionality. Do you have to sign up for an airtable account to use an interface (not creating records, just filtering)? And if they create a free account, is that enough when they have viewer access only? Do they get added as "seats" in the account?

Is there a way to run an automation for duplicates based on emails? I’d like for the automation to maybe mark the items as a duplicate using a checkbox and then I would sort them into a view that way. I hope that makes sense.