Nextcloud
https://nextcloud.comNextcloud is the most deployed on-premises file share and collaboration platform. Access & collaborate across your devices. Your data remains under your ...
Nextcloud - Apps on Google Play
play.google.com › store › appsThe Open Source Nextcloud Android app allows you to access all your files on your Nextcloud. Features: * Easy, modern interface * Upload your files to your Nextcloud server * Share your files with others * Keep your favorite files and folders synced * Instant Upload for photos and videos taken by your device * Multi-account support