I switched to the ‘acf/save_post’ hook instead of ‘transition_post_status’, per a support ticket, and it’s saving now 🙂
I got the post id by echoing out get_the_ID() (see code comments); I just hardcoded it to be sure. This was just a basic text field. To test, I was just saving the post and checking to see that the field had been updated from the edit-post view.
Note: For this to work, I set the priority to 20; leaving it as 1 (before post save) didn’t work.
Thanks for the help.
