I upgraded specifically to attach files to my invoices but I’ve found I’m unable to do so. I’m on Linux and using the snap because a Flatpak still isn’t available that I’m aware of.
This is a pretty big issue since I upgraded solely for this feature and now I have to work-around the problem by going through the cumbersome web app.
I’m running the app the way I’m recommended to (via snap) and your recommended method has a pretty big premium feature missing.
I require the Document attachment feature, so I’ll use the work-around of switching back/forth to the Web application until you decide to implement Flatpaks.