The fallback provider introduced in 5aeb2fd3 wrapped containerfs but did
not implement storage.ContainerFileOpener, causing IngestContainerFile to
fail with "provider does not support container file reading". This broke
outbound file attachments on all IM channels (Telegram, Discord, etc.)
because container paths like /data/xxx.xlsx were passed as-is to the
platform API instead of being ingested into the media store first.
Acbox
3fa311c6cb