SUMMARY

When trying to install fonts from samba shares, font manager can open share, go to the relevant directory and select the font, but installation fails with "The file 'smb://user@sambashare.local/fontname.ttf" could not be found'. File location is in `smb://user@sambashare.local/directory/fontname.ttf`, though.

STEPS TO REPRODUCE
1. Open System Settings --> Font Manager
2. Use button "Install font..."
3. Navigate to file location on a samba share, including opening network, password entry etc.

OBSERVED RESULT
Opening fails with error message above

EXPECTED RESULT
Font manager opens file and installs font, as it does with the same font when using a local location.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.19.0
Qt Version: 6.10.0
Kernel Version: 6.17.4-arch2-1 (64-bit)
Graphics Platform: Wayland
Processors: 12 × Intel® Core™ i7-10750H CPU @ 2.60GHz
Memory: 32 GiB of RAM (31.0 GiB usable)
Graphics Processor 1: Mesa Intel® UHD Graphics
Graphics Processor 2: Quadro T1000/PCIe/SSE2

ADDITIONAL INFORMATION
Happened also on numerous other systems with Kubuntu 25.10; tried to do this in a classroom setting, every student failed to install fonts that way.