Recorded clicks aren't playing back

I’m trying to automate the printing of a bunch of emails in Fastmail in the Chrome browser.
This involves clicking the More actions popup then Print in that list then clicking on the pdf Save button then typing a file name then clicking Save.

Recording seems to record most of these clicks, but when I try the macro none of the clicks seem to have an effect.

I’m suspicious that this Chrome app is very busy executing its own javascript and perhaps that isn’t compatible with Maestro’s clicking somehow.

Any experience that might help me?
I’m a newbie, though I’ve scripted and programmed quite a bit in the past.

Clicks almost always need a pause before them to ensure the screen is as expected before the click happens. Since the click typically has some effect (eg changes the screen/window/focus) and often these effects are often animated and/or slow to happen, posting two clicks in immediate succession will likely result in the second one being ignored.

Add appropriate Pause or Pause Until actions before each click.

Also, selecting popup menus is best done first with a click, and then with Insert Text by Typing "Menu Name%Result%" to select the item. Don't try to click the menu item, that is almost certain to be unreliable as the menus move and change.