It is common for some of our users to have accounts abroad and feel the need to control them on Mobills in the same way that they control their local accounts, using different currencies in the same control.
However, it is not possible yet to do this type of control in Mobills, it is necessary to choose a default currency and control your accounts based on that currency.
One tip we give is to change the description of the account that holds the foreign currency. For example: suppose you are Brazilian and control your main accounts in Real currency. However, you have an account in the USA and its currency is the dollar. In this case, continue with the control in reais and change the description of the US account to US Dollar Account, for example.
In any case, we take this option into consideration and we are always looking at implementations that are viable in the short, medium, and long term. This is certainly under constant discussion and, as soon as possible, we would love to implement it.