Exported Sprite sheet has only 1 frame
Hello community.
I have some questions puzzling me regarding adobe animate.
I'm trying to export my PNG sequence I designed from AE and imported into AA. when I select export sprite sheet, I end up with only 1 keyframe, although I have selected the symbol which was converted from the PNG sequence.
I also try the auto size, incase it can generate the PNG sprite for me. but It ends up exporting only 21 frames from the total frames.
for example I have 128 frames, and my artboard I have made 200 x 200p to get a nice square vertical PNG strip. this is what I need to do.
Thank you.
Images attached.



And is it possible for adobe animate to export large vertical sprite sheets, for example: 150 frames, and the PNG sequence is 1000pix X 1000 pix? Anyone familiar with Animate can test this please?
