Timestamp automation failure

[pjwallace1]

I was following the directions found here: https://support.airtable.com/docs/use-automations-to-timestamp-status-updates

However, when it came time to select the "Last Modified" field, per the directions, I saw an error stating that "this field cannot be used because it if computed".  What struck me as odd was that this was in contradiction to the exact steps to take in the link.  Now i can't complete this automation.

[TheTimeSavingCo · Accepted solution]

Seems like you might be trying to update the Last Modified Time field directly.  I assume you've created "Date" fields elsewhere?  Try selecting those to update instead: