When using Lumo Projects with files linked from Proton Drive, all files can appear correctly under Project Knowledge, but only a subset of them is available when typing @ in the chat.

This creates a usability problem: a file may clearly exist in Project Knowledge, yet it cannot be found or explicitly selected through the @ mention interface, even when typing part of its exact filename.

Because Lumo also uses smart retrieval, it is currently difficult to understand whether:

• the file has been fully indexed,
• indexing is still in progress,
• indexing has failed,
• or the @ autocomplete simply shows a limited subset of files.

It would be very helpful if Lumo could:

• make every file in Project Knowledge searchable and selectable via @;
• provide a proper filename search instead of only a limited autocomplete list;
• show an indexing status per file, such as Indexed, Indexing, or Error;
• optionally provide a Re-index action for a file or for the whole project;
• clearly document whether the @ menu is intentionally limited and how its results are selected.

At the moment, Project Knowledge and the @ file selector do not appear to expose the same set of files, which makes it hard to know whether Lumo can actually access a specific document.

For users working with many project files, being able to explicitly reference any file by name is important for reliability and reproducibility.