Environment

• OS: Debian 11
• DAW: Ardour 6.9.0
• Plugin: LV2

Steps to reproduce

1. Make a patch with a button which opens a file picker menu, as per the instructions on the wiki.
2. Make an LV2 plugin out of this patch using Camomile.
3. Load the plugin in a DAW and try to click the button.

Observed results

A blue menu will open but it will only show directories and not the files within them.

Notes

It is still possible to select a file by entering the directory containing the file and manually typing the filename into the box at the bottom. If the file exists, the "Open" button will work.