Can't transfer the files from IOS to stick

I have used the Sandisk Connect app on Android OS to copy various files I want to save from the phone to the drive, including podcasts that I had downloaded and wanted to back up.  Unfortunately, my Android phone recently broke and I needed to fire up my wife’s old iPhone 4s (fortunately she saved it for just such an emergency). 

So if I get this straight, Apple has restricted access so that I cannot upload anything but native photos and videos from the phone to the drive?  Not being able to upload podcast files is a huge disadvantage here.  Pretty useless having the drive if I’m not free to copy and paste the files I choose.  Just another example of why I tend to prefer Android devices and steer clear of Apple’s proprietary policies.