Esp-01 setup error while compilation

What limitations are those exactly, how many digital and analogue pins does your project require?

I think you misunderstood what I was saying - try re-reading my previous post.

Too lazy to search yourself?
Okay, here you go - this time…

https://docs.blynk.cc/#blynk-firmware-debugging

I think the clue is in the title of the YouTube video… “Enter Blynk Credentials Over the Air in ESP32 or NodeMCU board | ESP32 projects” and I already told you that you can’t do OTA with a Uno or Mega.

Pete.