Am I missing something? I've collected LPG 3 or 4 times, but it's not showing anywhere, nor can I use it. The LPG doesn't seem to be available for the upgrades.
There are many other threads covering this subject. A quick look at the list of threads would have helped you. Try this https://forum.pixelfederation.com/seaport/d/20964-how-do-i-get-lpg-useful-info
You will not see any LPG in your warehouse until you have completed delivery of ALL the required resources
