I dont know about kanban but the other stuff can be achieved via webdav. All major webservers can do that or you just use filebrowser.org (a selfhosted webdav server with built-in user management).
Wdym nginx is not supported? It very much is. Nextcloud is a pain to set up but after fiddling with settings for a day or two you can get it working smoothly. In my experience there are no good alternatives to it.
Synology is the answer.
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