What does mean the yellow bar on the available upload space?

Hello,

We have recently deleted old submissions to decrease the amount of space used on our account. The UPLOAD space remains half full and the bar is yellow. I don't want to run out of space through out the year. Can you explain how to decrease space and what the yellow bar vs green bar means? Thanks. 

I have recalculated your upload space and it shows "28.37 GB" now, the yellow bar is to let you know that you used already more than the 50% of your available upload space, so you should take any action like download your files and delete them from your account, that should clear up the space. 

Please, check on your end as the upload space bar should be showing green now, do let us know if you have any question.