I need to sync content from a webserver into my ios app, how to?

Hello,

for a configurator project I need to periodically (1x a week/month) sync content (textures, json) into my ios app. My idea (standard stuff) is to download the files to a permanent content folder then read them in (they are needed in packets of 1-3 as the user changes materials) as needed on runtime. The convert texture (jpeg,png) on runtime to a Textur2d part is easy done. But how do I download files and put them in any app folder on the ios device?