  Which theories have a higher dimensional origin in String/M-theory is a non
trivial question and it is still far from being understood in the constrained
scenario of maximal supergravities. After 35 years of progress in this
direction we have found supporting evidence in favor of the idea that every
electric maximal supergravity in 4 dimensions can be uplifted to M-theory. We
will review the current understanding of this problem with special emphasis in
the uplifting of non compact supergravities and their relation with Exceptional
Generalised Geometry.
