These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.
The resources of a droplet are set at boot time. When you resize everything is setup for the droplet to take advantage of additional resources, however, without a reboot - there is no way for the virtual server to reset it’s configuration.
The developer cloud
Scale up as you grow — whether you're running one virtual machine or ten thousand.
From GPU-powered inference and Kubernetes to managed databases and storage, get everything you need to build, scale, and deploy intelligent applications.