How could you access end-to-end encrypted cloud storage from multiple devices?
It's still encrypted, and in multiple jurisdictions so a legal order in any single jurisdiction only decrypts one layer of encryption.
"Telegram is a cloud service. We store messages, photos, videos and documents from your cloud chats on our servers so that you can access your data from any of your devices anytime without having to rely on third-party backups. All data is stored heavily encrypted and the encryption keys in each case are stored in several other data centers in different jurisdictions. This way local engineers or physical intruders cannot get access to user data."
https://telegram.org/privacy
They also offer end-to-end encrypted secret chats, which are not uploaded to the cloud and only available on the device on which they were initiated.
> Not on desktop and not on GNU/Linux phones (which I use).
That's unfortunate, but luckily the clients are open source, and anybody can create a new client for the platform of their choice. Telegram even provides a cross-platform API library: https://core.telegram.org/tdlib
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TDLib can be used on Android, iOS, Windows, macOS, Linux, WebAssembly, FreeBSD, Windows Phone, watchOS, tvOS, Tizen, Cygwin. It should also work on other *nix systems with or without minimal effort.
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It's still encrypted, and in multiple jurisdictions so a legal order in any single jurisdiction only decrypts one layer of encryption.
"Telegram is a cloud service. We store messages, photos, videos and documents from your cloud chats on our servers so that you can access your data from any of your devices anytime without having to rely on third-party backups. All data is stored heavily encrypted and the encryption keys in each case are stored in several other data centers in different jurisdictions. This way local engineers or physical intruders cannot get access to user data." https://telegram.org/privacy
They also offer end-to-end encrypted secret chats, which are not uploaded to the cloud and only available on the device on which they were initiated.
You are free not to trust them. But I do.