Cannot open Encrypted Royal TS document

Hello,

as per article: https://blog.devolutions.net/2016/12/launch-royalts-sessions-from-rdm-ios-android

I tried this, but unfortunately Im not able to open Royal TS document(created in Royal TS v5 beta) which is encrypted with password.
No matter what I do, when I add a new datasource in iOS RDM(Dropbox) and open Royal TS document,
it will ask for password, but when I will put my password in, it says it is invalid and sometimes made my royal TS document completely unreadable, and I must restore it from backup.
Im able to open unencrypted Royal TS documents fine.
Do you have any ideas why this is happening ?

Thank you