Allow multiple files to be uploaded

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 60.88%. Comparing base (44bcf4f) to head (5294f91). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
lumen/ai/ui.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #791 +/- ## ======================================= Coverage 60.88% 60.88% ======================================= Files 103 103 Lines 12566 12566 ======================================= Hits 7651 7651 Misses 4915 4915 ```

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