Hmmm, interesting. I’m on plasma 6 too. I have all the packages installed and bluetooth is working fine for my keyboard, mouse, and earbuds.
When I do what @biscotte describes, Plasma indicates my phone is not available. However it does work with KDE connect.
@biscotte Have you attempted to use KDE connect to send the document? I sent a 4.5mb photo and took less than one second. Maybe that would be a solution for you?
I don’t know if this topic is related or of any help.
Edit: I forgot to add. What packages are listed with pacman -Ss bluez (or with yay, depending on your preference)? For Plasma 6, this is what I have installed (a couple of which I manually installed and may or may not be installed for you.):
extra/bluez 5.73-3 [installed]
Daemons for the bluetooth protocol stack
extra/bluez-libs 5.73-3 [installed]
Deprecated libraries for the bluetooth protocol stack
extra/bluez-qt 6.0.0-1 (kf6) [installed]
Qt wrapper for Bluez 5 DBus API
extra/bluez-qt5 5.115.0-1 (kf5) [installed]
Qt wrapper for Bluez 5 DBus API
extra/bluez-tools 0.2.0-5 [installed]
A set of tools to manage Bluetooth devices for Linux
extra/bluez-utils 5.73-3 [installed]
Development and debugging utilities for the bluetooth protocol stack
Additionally, @biscotte please check if bluez-obex is installed. It was separated out from bluez and is required for sharing or transferring files via bluetooth. You can use pacman -Ss bluez-obex to see if it is installed.