Is there an operating manual for RevPi Cloudrail? I couldn't find it on the official website.

the official CloudRail documentation is published under following link:

https://devices.cloudrail.com/documentation

A quick start tutorial is published under following link:

https://cloudrail.com/quick-start-guide/

Do i need a CloudRail Subscription if i use my own azure account

Yes, CloudRail always requires a CloudRail subscription. This is due to the fact that CloudRail is a managed service. The subscription includes things like the Device Management Cloud, support, remote security and feature updates and much more. There is a free developer plan for testing available.

Learn more about our pricing: https://cloudrail.com/pricing/