Note: Firefox users will experience a 4-5x slow upload speed than other users on a different browser. There is also a known upload issue for Mac OSX Sierra users using version 1.2.2 of CloudSpot or older, please update and the issues will be resolved.
Your Energy Saver preferences may be interfering and interrupting uploads if you have your computer set to go to sleep after a specific period of time. Having your display go to sleep will not affect uploads, however, your upload will not progress if your computer goes to sleep.
When uploading on a laptop, we always recommend having your laptop plugged into power to ensure the battery doesn't die during the upload.
Open your System Preferences > Energy Saver (Battery if you're on a laptop) settings, and check the box next to "Prevent computer from sleeping automatically when the display is off".
Open the Start Menu and do a quick search for your computer's sleep settings. Under the Sleep preference, select "Never".
Ta-da! ✨ Now you can get all of your beautiful photos uploaded with no interruption!