transfer file from PC to iphone without using itunes

I'm sure I have not posted to the correct community but none of those listed seem relevant, so, sorry, Home Sharing, you get it!

I'm using Win 10 and do not have itunes installed on my PC.

I must have done this binary file transfer in the past because there is an old copy of the file, and its supporting app., on my iphone 6. I now need to update that binary file .However following the generic instructions from Apple (and many others following a Google search) makes no sense to me. The steps are as follows:

Connect your iPod touch, iPhone, or iPad to your computer and select your device.

Select my device? How? Where?

Click Apps

There is nothing that I can see on my PC called 'apps' - anywhere

Below File Sharing, select an app from the list, and click Add.

Huh?

In other words the instructions are completely useless. How is this simple transfer done?.