Every month you receive a supply drop, which can be collected over 3 days at a certain spot on the Geoscape.
I ignored that pick up partially and after a while I've received a message saying that all resources have been gathered and new items are available at Resistance HQ. I didn't look at my supplies or the date, when it happened so I neither know whether I got the supplies nor when they expired.
So my question is: Is the monthly supply drop picked up automatically after a while or does it expire and the supplies are lost? How long does it take to expire?