I hope you are doing well. According to your records, you bought “Build ESP32-CAM Projects using Arduino IDE eBook” which you can download here: https://rntlab.com/welcome-esp32-cam-projects/
- When you download, the file comes in .zip folder that you have to unzip. Did you unzip it?
That is because iPad does not have an unzip function. You will need to download to a computer (Mac/Linux/Windows), unzip the file and then transfer it to your iPad.
OR Rui could provide a link to the unzipped PDF.