I am working on a project that will use both the Arduino Uno and the MKRZero in the end; the Uno carries the bulk of the program and the MKRZero would have code related to its audio file functionality. Since this project is intended to work independently of a computer once it is finished, the Uno would be powered via USB cable controlled to a wall adapter in an outlet. However, this leaves the problem of how to power the MKRZero.
So my potentially dumb question is: since the MKRZero takes 5V to be powered, could I connect the Uno's 5V output pin to the MKRZero's Vin pin to power the MKRZero? If this is possible, what other connections would I have to make to make sure both boards are operating properly?