Is there a way to save a pdf on an iPhone 6

[StephenG1CMZ]

Specifically, the latest Prime documentation.

I tried it the other day and all seemed well: within the book symbol were a pair of reading glasses and within them was a list including what I wanted and I could read it. Of course the iPhone hasn't got a file browser that I can tell, so I couldn't be sure I had the long document rather than the quick start guide.

Then, I moved to an area with poor signal coverage.

Now all I see is a message about not being able to read that because I have no signal.

Does that mean that I have wasted untold Terabytes of bandwidth re-loading something that as far as one could tell was local?

Is there a way of storing something locally on an inferior phone such as an iPhone 6?

And what is the reading list for if it can't read???