Turn Off Auto-Lock

The website is great and simple, but when using it to transfer files between my iPhone and Computer the iPhone always tries to turn off as I am just waiting for it to recieve the files. I know there's a workaround to turn off the Auto-Lock in Settings, but I don't like to turn it on and off whenever I want to transfer files.

I think you can simply make the website as if a media is playing, like when I use YouTube it doesn't turn off as there's a media playing.