IOS File Directories

Im not too familiar with Apple devices or their file system structure, so I was wondering if someone who is could tell me where files should normally be moved or saved to, such as recorded video or photos. I see these system variables:

Capture

I have always used systemVars.fileSystem.directories.document for IOS
But should the systemVars.fileSystem.directories.ios be used instead?

I have the same question. It seems like only systemVars.fileSystem.directories.document is working properly. But then again, I couldn’t find the file. It’s there, but couldn’t find it.

Is there any way to save the downloaded file / written file directly in the iPhone download folder?