Here are screenshots of the automation, and the slack message script :
Automation finds all records where the last updated time is less than 24h.
Lenth of record is the number of updated record pulled from the result of the “find record” action.
List of aircraft makes a list, separated by comas, of all the records first field pulled form the “find record” action.
List of airtable url is a list of url pointing to each matching records.
I didn’t find an option to insert a formula in the field for Slack ?