如何从网站下载文件到用户的iCloud

I have an iOS app that downloads data files from webpages. Often a user will come across the webpage, but will not yet have the app. Rather than get them to download the app and then re-find the webpage within the app, I would like to download the data file, then have the app pick that up when it is installed. From what I can gather, I need to put that file in the iCloud. But when I try to download the file with Safari, it tells me it cannot download the file. If I use Chrome, it wants me to use GoogleDrive to save the file. Is there a way a webpage can save a file to iCloud? Or is there some other way to tell the app what file to download when it has been installed?I have an iOS app that downloads data files fro