M5Burner cannot publish BIN file due to DBus error

[LBertrand]

Hello,
I am trying to publish a firmware .bin file with M5Burner. The problem is that the + buttons to select the .bin file or the cover illustration do not respond.

In the terminal, I get this error message.
[16551:1207/221226.940000:ERROR:select_file_dialog_impl_portal.cc(698)] Portal returned error: org.freedesktop.DBus.Error.AccessDenied: Portal operation not allowed: Unable to open /proc/16551/root

It seems to be trying to open a connection to another process but cannot access procfs as non-root. I tried running M5Burner as sudo but it won't start because of a security restriction apparently in Chromium:
[1207/223917.916497:FATAL:electron_main_delegate.cc(290)] Running as root without --no-sandbox is not supported. See https://crbug.com/638180.

This is running on Linux Mint 22 Cinnamon (amd64), based on Ubuntu Noble.

Any suggestions?
Thanks
--Louis

[kuriko]

@LBertrand
have you tried sudo --no-sandbox ./M5Burner ?