I want to create a flutter application for a cloud storage application I am working on. I want this application to be able to "mount" a drive in the system file explorer that will then be linked to my cloud storage application (There are certain apps that can do this, NextCloud, IServ, see screenshot). Is there an android reference page to such an API / or even an API wrapper for flutter?
I have tried google-ing, but have not found an answer on how to do this. I have also tried inspecting NextCloud's source code but didn't arrive at a solution neither.
I've never used NextCloud. But after reading your question and looking at the official documentation, there are client APIs available for NextCloud, and they are WebDAV based.
I don't know if you've tried it, but there's a package that allows you to use webdav in flutter. You can use it to get a list of files in NextCloud, and use the API to access specific files.
NextCloud API : https://docs.nextcloud.com/server/19/developer_manual/client_apis/WebDAV/basic.html#webdav-basics
webdav_client : https://pub.dev/packages/webdav_client