The Preferences submenu on the Pixel Editor's Tools menu allows you to customize the behavior of certain functions in the Pixel Editor:
Save As
Selecting “Preferences” and then “Save As” from the Pixel Editor's Tools menu allows you to customize the default suffix that is applied when performing the File > Save As function. Choosing the “Date and Time” option is particularly useful for making multiple backup copies of your sequence. If you enter custom text, you can only use characters that are valid in Windows file names (e.g. these characters are forbidden: * . " / \ [ ] : ; | = ,).
Save As preferences