\begin{document}$ \sqrt{s_{NN}}=5.02 $\end{document} TeV. The internal evolution of heavy quarkonium is described by a time-dependent Schrödinger equation with a temperature-dependent complex heavy-quark potential, while the evolution of the hot QCD medium is simulated using the iEBE-VISHNU event-by-event viscous hydrodynamic framework. By incorporating both fluctuating and smooth hot media, we find that the bottomonium nuclear modification factor \begin{document}$ R_{\rm{AA}} $\end{document} is only marginally affected by event-by-event fluctuations. In contrast, the elliptic flow \begin{document}$ v_2 $\end{document} is systematically enhanced, with the enhancement increasing from the tightly bound \begin{document}$ \Upsilon(1{\rm{S}}) $\end{document} to the more weakly bound \begin{document}$ \Upsilon(2{\rm{S}}) $\end{document} and \begin{document}$ \Upsilon(3{\rm{S}}) $\end{document}. This enhancement arises from the more pronounced participant-plane anisotropy of the fluctuating medium relative to the smooth optical-Glauber reference geometry. These results indicate that a smooth hydrodynamic background reproduces the bottomonium \begin{document}$ R_{\rm{AA}} $\end{document} but underestimates its \begin{document}$ v_2 $\end{document}, implying that the bottomonium \begin{document}$ v_2 $\end{document} retains a discernible imprint of event-by-event medium fluctuations."> Effects of event-by-event hydrodynamic fluctuations on bottomonium dynamics in Pb–Pb collisions at <inline-formula><tex-math id="M1">\begin{document}$ \sqrt{s_{NN}} = 5.02 $\end{document}</tex-math></inline-formula> TeV -
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