Every Proof and Version of a proof is named, by default, the name of the file that was uploaded as the Proof or Proof Version.
But, you can change this name if you wish. Here's how.
To change the Proof Name
Open the proof and in the upper left corner
Click on the proof name
Edit the name
Use tab, enter or click off the name box with your mouse to save
To change the Proof Version Name
Open the proof and in top of the right sidebar
Click on the proof version name
Edit the name
Use tab, enter or click off the name box with your mouse to save
