I've always been an iPhone user and have never seen a .txt file on one and probably you wouldn't be able to edit one on an iPhone if you did have it in Files app - I'm not counting Notes app as a text file here.
I do quarterly notes inside of Notes app but it mostly non-work related stuff and doesn't integrate well with desktop since its kind of a pain to login to iCloud from browser. Quarterly notes bc once the note gets too long, it gets very laggy on phone and is difficult to navigate; i.e. getting to the bottom to write a new line can be tough on mobile.
The idea of paying a subscription for the privilege of being scammed sounds ridiculous. The cost of deliveries doesn't magically go down because you're paying a subscription. You're paying for it either way. Either you're overpaying on the subscription because you're not ordering enough or you're overpaying in the form of higher prices that contain the remaining delivery fee.
I moved to digital players as soon as I could afford them. The most memorable (before the iPod) was the Creative Nomad with its 5GB hard drive. It was too big to fit easily in my jacket pocket, but I shoved it in there anyway. I didn't have to choose the tapes I had on my long bus commute anymore. And when the second-gen iPod came along, it was like heaven.
I'd never go back to cassette...but it was great when there was little else available.
She finally solved it by hanging garlic cloves around her cubicle. Of course there's no reason this should have worked. But she had no more difficulties after that.