  Given a connected Riemannian manifold $\mathcal{N}$, an \(m\)--dimensional
Riemannian manifold $\mathcal{M}$ which is either compact or the Euclidean
space, $p\in [1, +\infty)$ and $s\in (0,1]$, we establish, for the problems of
surjectivity of the trace, of weak-bounded approximation, of lifting and of
superposition, that qualitative properties satisfied by every map in a
nonlinear Sobolev space $W^{s,p}(\mathcal{M}, \mathcal{N})$ imply corresponding
uniform quantitative bounds. This result is a nonlinear counterpart of the
classical Banach--Steinhaus uniform boundedness principle in linear Banach
spaces.
