export animation as series of .pngs

[handrawn]

you can do this

on the options tab in the PNG export dialog - tick 'export each layer to a file of its own'

note: before you export you will need to have clicked the 'all frames visible' button on the animation frame gallery, otherwise it will only export the active frame

EDIT- note you should also use the general 'export' file option for this [choosing PNG as file type to save], and not the 'export PNG' option which is really for web use I think and does not give the same options