Yes, you can unsubscribe at any time. Once canceled, you will continue to have access to your subscription features until the end of the billing cycle, after which your account will be downgraded to a free version with limited features.
You will still be able to download your uploaded files if you downgrade, but adding new files and exporting files inside health reports will be disabled.
Important Note: Files will be auto-deleted after 12 months of no active subscription.