All my sprites.

Ive been working on a project (RPixelG, https://microstudio.io/ItsRPixelG/rpixelg_og/WK4ANNBB/ ) and its at 10 MB. When i go to make a new sprite, all the other sprites dissapear. only the ones in a folder stay. Can someone help me?

There is a limit on the size of the project - it is 10MB. Why Sprites disappear I don't know.