I created an S3-compatible data source (Wasabi), using “Keep data structure on storage”, and during sync only the first 1,000 files are detected (plus one additional node, probably the root). Re-sync doesn’t retrieve any more files than this, and my bucket has thousands.
This was not a problem in Pydio Cells 4.0.0 RC2. Thought I should bring this up since for a Release Candidate this is a pretty serious problem.