Some people need just a little hint, others need to be given step by step instructions. We all think differently. (An engineer would need less help with a phone than an artist would, but most engineers have no idea what the rule of thirds is.) We have no idea who's going to find this thread on Google 2 years from now, and come here to find out how to do exactly what the thread explains.
Or, looking at it another way, you can skip any information you already know, but you can't make up information the person explaining it left out. Microsoft's manuals used to be the perfect example of a user manual - they explained everything - even things you would expect anyone using a computer (this was in the 80s and early 90s) would already know. If you just forgot the exact syntax of a command you could ignore the 5 other pages of explanation of how that command worked (the COM command was enough to make a whole book by itself), but if you needed all that information it was there. Compare that to the manual supplied with current cellphones. Warranty, accessories, all sorts of things to waste paper and ink, but almost nothing about how to use the phone that you wouldn't find in a manual for a phone sold in 2001.
How to transfer pictures from internal to external storage should be in the manual. (Maybe not an explanation of the fact that "Gallery" is an app, not a place where pictures are stored, but at least where you're most likely to find pictures, what app to use to find them and how to move or copy them.) If you want to save resources, there could be a file on the phone, with a link on the homescreen, with a huge manual - that explains how to copy the manual to your computer and delete it from the phone to regain the storage space, along witgh all the other things people ask about, including how to find and copy pictures. (Once it's in the ROM, it's free to the manufacturer - they have to flash the ROM into each new phone anyway. The amortized cost of writing the manual would be less than a penny a phone.)