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Thank you for posting this challenge, it is really interesting.
The most challenging aspect for me, personally, is how to make the solutions as generalised as possible, such as being able to take in unlimited number of digits and design the logic flow so that it can handle generalised the problem of adding numbers of different numbers of order of magnitudes (e.g. how to handle if the remainders when added together exceed the divisor).
I solved it using 3 iterative macros and this seems to work when tested with extra long numbers.