Lost access to lakehouse Files functionality

This sounds like a potential sync or metadata issue between Fabric and OneLake. A few things you can try:

1. Try uploading the file with a simplified name (e.g., testfile.csv) – avoid special characters.
2. Use a different file format (e.g., .txt or .parquet) to see if the issue persists.
3. Clear your browser cache or try a different browser – sometimes the UI gets stuck.
4. If the file appears in OneLake Explorer the next day, it might be a delayed sync issue.
5. Since it happens even in new Lakehouses, I’d recommend opening a support ticket – this might be a backend issue.

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