Cannot open files on network share SMB but can open if it is copied to desktop

I have a QNAP NAS with SMB turned on. We are running the Ubuntu 24.10 on every computer in our office with KDE plasma except for one Mac. If I open Dolphin, click on network, connect to the smb share that is there I can open any of the shared folders. I can open every PDF on the SMB share with Okular. I can open .jpeg files with Brave-browser, or image viewer, but if I right click and try to open a .jpeg with Firefox I get a long error message about not having the right permissions. If I try to open a word file or excel file from the network share, using libre office, I get a permissions error as well. BUT, if I copy that file, to the desktop… those files all open just fine.

It is my understanding, that something like kio-fuse is having an issue with opening anything that isn’t a “kde blessed” application. What is driving me crazy is that I have a few older pc’s that I had originally run ubuntu 22.04, then upgraded to 22.10, 24.04 and now 24.10… along with all the kde plasma updates (but all probably had kde 5.27 or so) and they connect to the share exactly the same, and can completely open any of these files with NO issues. The PC’s that are fresh 24.10 installs (not upgrades from older versions) all cannot open the .doc, .xls (libre office) and .jpeg (Firefox) files but are perfectly fine with the .pdf’s in Okular. They also work perfectly if I copy the file to the desktop… but working off the network folder they just refuse.

I can screenshot the error code, but I have a feeling it is something to do with this kio-fuse thing, but I don’t know how to resolve it. I don’t understand how to install the kio files from git (or if that will solve my issues). I just want to get these machines to work with the SMB share… or some other option. It’s a small office, we save everything to the NAS, and up until me setting up these 2 new computers, I had no issues with Linux and kde opening and sharing files. your advice would be appreciated.

I believe I figured out a fix, but do not know why it works. I went into terminal and ran all of these:

sudo apt-get remove --purge “libreoffice*”
sudo apt-get clean
sudo apt-get autoremove

But libreoffice was still installed, so then i ran

snap remove libreoffice

and eventually all of the libreoffice installed files appeared to be gone. just in case I ran everything above a second time and did a quick reboot.

After that i went back to discover, search just for Libre and ONLY installed libre writer and librecalc from discover and i’m 99% those are just snap installers.
Now that everything was installed from this version of KDE plasma and directly from the discover store… .doc .xls and similar files work correctly with kio-fuse and I no longer get a permissions error.
I have also went in and made sure that all default applications for file types are “kde application blessed” Reminds me of blessing a mac OS system folder back in the classic os realm.

Why did this work? I still do not know but i care more about it work than how… I am a small business owner, i sometimes don’t have time to care how the sausage is made… i just care that it works and tastes like sausage. (hence the appeal of the mac and windows world) but this is now working so I will close this help thing out if I can.