I was using IE or whatever passes for the replacement with Windows 10.
When I'd do upload and insert an image from my computer things would go along normally but then it would just sit there deader'n a mackerel.
I tried it about 3 or 4 times, got out of AC, managed to upload the same photos on another site, came back to AC and no upload.
I switched back to Windows 7 Pro and everything worked just fine.
What email issues are you having? Part of me wants to upgrade but another part sure hates all of the aggravation that goes along with it.