2D sprites Sheet?

Ok so I have a large 2D Spritesheet all the animation frames in with rows and columns format.
Is it 100% necessary to bust the sheet up by extracting the sprites out of the sheet to do flipbook animations or can I use a single sheet and use that for the flipbook animation? When I load the whole sheet into the flipbook editor I see the full on sheet.
Is there is a way to use the single sheet, what steps am I missing ? I haven’t come across anything in the documentation.