  We explore the dynamical transport of an impurity between different embedding
majority species which are spatially separated in a double well. The transfer
and storage of the impurity is triggered by dynamically changing the
interaction strengths between the impurity and the two majority species. We
find a simple but efficient protocol consisting of linear ramps of
majority-impurity interactions at designated times to pin or unpin the
impurity. Our study of this highly imbalanced few-body triple mixture is
conducted with the multi-layer multi-configuration time-dependent Hartree
method for atomic mixtures which accounts for all interaction-induced
correlations. We analyze the dynamics in terms of single-particle densities,
entanglement growth and provide an effective potential description involving
mean-fields of the interacting components. The majority components remain
self-trapped in their individual wells at all times, which is a crucial element
for the effectiveness of our protocol. During storage times each component
performs low-amplitude dipole oscillations in a single well. Unexpectedly, the
inter-species correlations possess a stabilizing impact on the transport and
storage properties of the impurity particle.
