Essentially any large flush through my house (washer, shower) has started coming up through my basement drain in the floor. I bought this house two years ago for full price and already am 20k deep in hidden repairs (all from basement flooding, yayy). I can explain if I need to, but I really just don’t have extra funds to put to this after the others. I’m thinking I can’t bathe with more than a gallon of water and not wash dishes or clothing until I can fix it.
Might be worth a look yourself:
Anykit USB Endoscope Camera with 8 Adjustable LED Lights, Borescope with Semi-Rigid Snake Camera, IP67 Waterproof USB Inspection Camera for Phone & Tablet (33ft) https://a.co/d/aiNASM6
This probably won’t be useful as OP won’t be able to see anything in a pipe full of water/sewage and will need to clean the clog or obstruction out first in order to drain it.