I have trouble trying to input anything that requires a plus-minus sign:
e.g.
"x ± 1 = n^2" returns nothing.
"x plus-minus 1 = n^2" returns nothing.
"x plus or minus 1 = n^2" returns nothing.
The extended keyboard also doesn't help, because the plus-minus sign doesn't show up there either.
I tried copying the sign from formulas that use the plus-minus sign (e.g. the quadratic formula, etc.), but it refuses to input the whole formula, instead asking me to purchase Pro subscription to use Input Zoom on the quadratic formula etc. Absurd, isn't it?