ESA50: can I send back the form and additional evidence in a larger envelope?

Put it in a larger envelope and pay for special delivery, forget the Freepost.

Now that I've sent off the form, what should I expect next? It's almost 5 years ago since I last completed an ESA50 and i can't remember what happened after I posted the form. Will I get a text to say that the form has been received or to inform me how the review is progressing? I had a PIP review in March 2022 and got a couple of texts from PIP to update me on what was happening. For PIP I was given a paper assessment and it was done by the DWP Case Manager and not by a healthcare provider, the Case Manager said there was no need to refer it to IAS. For ESA I expect it will be the healthcare provider who will look at the form and not the DWP although I'm not sure exactly how it works these days. Will the first I hear about my ESA review most likely be an appointment letter for an assessment? Or will there be text contact before that?