Under the render button in Export you can hand the job to the studio server instead. It costs one credit per track minute, with a 20 credit minimum, and it keeps rendering when you close the studio or lock your phone. The finished file waits in Export for 48 hours and downloads straight to your device, which makes long tracks reliable on phones.
Jobs render one after another; the Export lane shows your place in line and live progress. Canceling a queued or running job returns its credits. If the studio restarts mid render, the job fails honestly and the credits come back on their own.
The studio server renders generated voices and library music beds. Uploaded music and your own recorded takes stay private on your device and are never uploaded, so programs that use them render with the regular Render button.