Reliable, Cheap, Per-Folder Two-Way Sync For Android That Nextcloud Self-Hosters Have Begged For Since 2016 And Still Patch Together From Paid Or Abandoned Workarounds
People who self-host Nextcloud want true automatic two-way folder sync on Android, edit a file on either side and both converge with conflicts handled. Nextcloud's own client still only does one-way auto-upload after a decade, so users cobble together a paid app, an opinionated one, or a discontinued peer-to-peer tool. The unmet need is a polished, free or cheap, per-folder-configurable WebDAV sync client people can actually trust with their files.
The trap is treating this as a sync-engine problem. EasySync already syncs fine, people still complain because nobody nailed trustworthy conflict resolution and per-folder direction control. Win on transparency and control over what moves where, not on the sync loop itself.
landscape (4 existing solutions)
Every option is a compromise, paid, opinionated, peer-to-peer, abandoned, or a different protocol entirely. The official Nextcloud client has punted on this for ten years, so demand keeps flowing to imperfect third parties and nobody has shipped the trustworthy, flexible, low-cost version users keep asking for.