Frame-breaking realization that there’s no download folder on an iPad, and all data is managed under software control. Tried a variety of FTP servers and wifi transfer apps on iOS from Apple App Store, discovered that files transferred by one app won’t be accessible by another. This isn’t the way my Google Nexus tablet and smartphone work under Android (or any other Linux-based computing device)! I hadn’t originally intended to jailbreak this inherited iPad, but now appreciate why so many people do it. See “Where is the iPhone downloads folder?” at https://www.quora.com/Where-is-the-iPhone-downloads-folder