  Ultra-peripheral collisions (UPCs), studied using the ALICE detector, allow
us to investigate the low-$x$ behavior of the gluon distribution of the
colliding particles. Two new measurements of coherent J/$\psi$ photoproduction
cross section from Pb-Pb UPCs at $\sqrt{s_{\rm NN}}=5.02$ TeV are presented:
the first measurement of the $|t|$-dependence of the cross section providing a
new tool to investigate the transverse gluonic structure at low Bjorken-$x$ and
a rapidity-differential measurement at midrapidity allowing us to provide
stringent constraints on nuclear gluon shadowing and saturation models. In
addition, prospects for heavy vector meson photoproduction measurements in LHC
Run 3 and 4 are presented.
