[FEATURE] Cloud-storage source ingestion (Dropbox) — nice-to-have

[Luca-Timo]

Pull photos INTO a gallery from cloud storage (Dropbox). PicPeak has S3/local/rsync backup destinations but no cloud-as-a-source import.

• Dropbox source connector → import into an event

Effort: M. Nice-to-have / low priority.

Parked idea — no timeline.