Although it has the potential to be a good tool, it's easy to see why the security guard would bend at the thought of storing sensitive info in the cloud. Telegram says your documents are protected by end-to-end encryption, though, and apparently does not seem what you are uploading. The company also plans to move all Passport data to a decentralized cloud in the future, which means it will be distributed across multiple computers to make the system safer.
Services that choose to integrate Passport into the system, allows you to register using Telegram's new feature. Doing so will allow them to request the documents you have stored in Passport. The company aims to introduce third party verification in the near future, and when it comes, companies using Passport will not even have to ask for your documents. They let you easily sign up for their services and know that a verification vendor has already verified that your IDs are legitimate.
The updated app is now available for both Android and Apple devices, and further squeezes the fear that the iOS version will lag behind its Android counterpart. Back in May, Telegram's founder said Apple blocked the messenger's updates from rolling out after being banned in Russia. Cupertino began to approve updates again shortly after he sent his complaints. To access the new feature, go to Settings> Privacy & Security> Telegrampass on Android or to Settings> Telegrampass on iOS.