How are the usual measurement in quantum mechanics related to the description of interaction by Feynman diagrams?

Try to formulate the question more clearly. Using Feynman diagrams, the amplitude of particle interaction is calculated, and through it, the probability of detecting this interaction in an experiment.

But there are other types of observations, for example, measuring the location of an electron. It is well known that the probability of finding an electron in a given region of space is equal to the square of the modulus of the electron wave function. That is, the probability amplitude directly answers the question about the probability of detecting an electron.

The very concept of "detection" means that the electron interacts with the particles of the measuring device. Here the Feynman diagram method and the interaction amplitude come into force. Do I understand correctly that the wave function of the electron is somehow related to the amplitude of the probability of interaction with the particles of the measuring device, and each such amplitude can be calculated using Feynman diagrams?

It turns out that there is something unambiguous in quantum mechanics! The point is that the interaction of quantum particles either occurs (with some probability) or does not occur. But there is never a superposition <happens + does not happen>.