I also have had the issue with missing attachements.
Having had a 925 & 640 I splashed out on a 950 plus wireless charging plate, case, microSD card.
As an actual phone, its OK, although cellular reception seemed a bit weak. Email, calendar, contacts and camera were all good - reasonably straightforward and simple which appeals to me. Battery life: meh, but fast and/or wireless charging helped a lot. Size and weight suited me, and the screen was fine. There were a few unique features I really liked such as the Start screen, Glance, and Cortana reading my texts out in the car.
Fast forward a couple of months and the 950 is in the drawer gathering dust and I'm back using the Note 4 (never use the stylus BTW). Too many of the W10M apps are just terrible. The animation flipping between apps and Start really began to irritate after a while.
Since the Note 4 got Android 6 and I spent some considerable time tweaking it, it is streets ahead of the 950 in almost every department - speed, battery life, apps - both choice and quality. The Note 4 is a bit big and heavy, but otherwise it suits my needs a lot better.
I'd love W10M to be a wholly viable choice in the market, but on the 950 I don't think it is
