Problem with KDE Font Viewer

I tried to open a font file (.ttf) on Fedora 34 KDE with its own Font Viewer, and got
an error message says “Could not read font”.

The font file has been used on Windows, Mac and other Fedora Spins with Gnome
Font Viewer installed.

Wonder what I had done wrong.

Also, is it possible to remove KDE Font Viewer and use Gnome Font Viewer instead?

Thanks!

https://flathub.org/apps/details/org.gnome.font-viewer

flatpak install flathub org.gnome.font-viewer
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