Ok; two things:

1. For "objects" and "artwork" it says that quality is above 100% (108% and 119% respectively), which is weird and doesn't inspire confidence? It's also unclear generally what those percentages mean.

2. When trying this from work it says "Unable to connect to the worker. Is your firewall or proxy blocking WebSockets?" -- it's possible that the firewall is the culprit but there should be a workaround? (All methods give the same result, drag'n drop, ctrl+v, or picking from the explorer).