alt Hacker NewsNot GP but I've also had issues with the Signal Desktop app (installed from the Arch repos).
Its overall a little sluggish in general (like most Electron apps though, in fairness) and occasionally clicking and dragging images onto the application will cause it to freeze and eventually crash.
Plus, the general usability issues present in all variants of the signal client (like no easy way of restoring previous messages on a new device).
It's not terrible or anything, but it's just a solid 6/10 application. I personally wish they were more open to 3rd party clients, so I could have something that integrates with my desktop environment a little better and is snappier, like my Matrix clients.
I'll have to try clicking and dragging images onto the Signal application and see if I notice any difference. I usually actually click the button to add an attachment and then browse to it. I'm also on Win11 but I would hope the experience between OSs wouldn't be too drastically different.