Upload is unavailable
The member upload page shows this banner when no upload source tab is left — Files, Remote URL, and Copy are all disabled by site mods.
Why this happens
visibleTabs.length === 0: Desktop uploader (toggle.m_z), Remote URL upload, and Copy from public are all off. This is a UI empty state, not an API 503. Upload maintenance is a different message (“Uploads are temporarily under maintenance…”).
Diagnose and fix
1. Settings → Mods — enable at least one of: Desktop uploader, Remote URL upload, Copy from public.
2. Refresh /upload after saving.
3. Tier blocks (uploads off, remote blocked, copy blocked) can empty the useful options even when a mod is on — check Users & limits too.
4. If the whole site is in upload maintenance, clear that toggle instead.