  We measured the complex conductivity, $\sigma$, of FeSe$_{1-x}$Te$_x$
($x=0-0.5$) films in the superconducting state which show a drastic increase of
the superconducting transition temperature, $T_\textrm{c}$, when the nematic
order disappears. Since the magnetic penetration depth, $\lambda$ $(>$ 400 nm),
of Fe(Se,Te) is longer than the typical thickness of the film ($\sim$100 nm),
we combined the coplanar waveguide resonator and cavity perturbation techniques
to evaluate both the real and imaginary parts of $\sigma$. Films with a nematic
order showed a qualitatively different temperature dependence in penetration
depth and quasiparticle scattering time when compared with those without
nematic order, suggesting that nematic order influences the superconducting gap
structure. Conversely, the proportionality between superfluid density,
$n_\textrm{s}$ ($\propto\lambda^{-2}$), and $T_\textrm{c}$ was observed
irrespective of the presence or absence of nematic order. This result indicates
that the amount of superfluid has a stronger impact on the $T_\textrm{c}$ of
Fe(Se,Te) than the presence or absence of nematic order. Combining these
results with band dispersions calculated using density functional theory, we
propose that the change of the Fermi surface associated with nematicity is the
primary factor influencing the change of $T_\textrm{c}$ and the superconducting
gap structure in Fe(Se,Te).
