Uploader either won't start an upload (stuck at 0% Uploading) or is stuck at something less than 100%

This tends to happen when your computer isn't in sync with the server that the file is being uploaded to, or more specifically, your computer clock is out of sync with the internet. To force computer time synchronization varies on Windows operating systems, but on Windows 10: 

1. Close FarmLens Uploader
2. Click the date/time at the bottom right of your screen
3. Click "Date and time settings" near the bottom of the pop up that appears
4. Click "Date & time" on the left hand side on the window that pops up
5. Towards the top on the right hand pane is a setting called "Set time automatically", toggle this between on and off. Sometimes you may need to do this multiple times.
6. Open FarmLens Uploader