If you and your partner are wanting to share all the information you both store in mSecure, it would be best to share one account, and use mSecure Cloud syncing to keep your information in sync. Right now, do you have all you and your partner's data stored in your mSecure account?
In order to share an account, you would simply have your partner download mSecure onto their devices and sign in to your account when they set up the app. It's easiest to share your information using mSecure Cloud syncing in this context, because you don't have to make sure you are using the same third party cloud account for Dropbox or iCloud (if you are using Apple devices).
If your partner is already signed in to an mSecure account in the mSecure apps running on their devices, then you would need to reset the app first before signing in to your account. Can you let me know if your partner has a different mSecure account than you? Also, on what types of devices are they running or will be running mSecure?
As long as your partner isn't using mSecure on a Mac, all they will need to do is reinstall mSecure on his different iOS devices. If he has a Mac, there is something else that needs to be done to reset the app. After the app is reinstalled, then he would simply sign in to your account instead of his own.
The problem here is that when he does this, he will lose any data currently stored in his account. There is no way to merge data from two different accounts. That may not matter here, but I do need to make clear what will happen. If your partner has any data stored in mSecure that needs to be moved over to your account, he will need to do that before he reinstalls mSecure and signs in to your account. Does that make sense?
It's no problem at all. Your partner will just have to reinstall mSecure on his iOS devices:
Were you able to reinstall mSecure and sign in to your account on his devices?
That's great news Annie! It's good to hear everything is working now on your partner's devices. Thank you very much for your time, and please let us know should you need further assistance.