Your system has no access to some APIs that are on LAN or firewalled for security reasons. Please allow saving API settings even when the TEST doesn’t pass for YOU 
Would be a huge timesaver when really cranking up more complicated API calls. Some of my Airtable API calls have double-digit fields, multiple data types, etc., and therefore are difficult to get perfect at times. Saving a nearly-correct version would be a big timesaver so that I can go back and forth as needed. Sometimes that requires a change in Airtable, and therefore an update of the external collection, so saving would be really helpful.
I agree! Sometimes I’ll setup a complex custom action but need to come back to it later but can’t! It’s like an adventure game that you’ve been playing for hours then you die and haven’t saved 