I can tell you.
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1 - press the blue icon that looks like a pencil.
2 - you can edit the size of your brush by tapping on it.
3 - use the paint bucket tool next to the eraser (idk 😐) and make sure there are no gaps
4 - the eraser erases
5 - select the circle 🔵 thing to change colours
6 - the arrow facing backwards is undo
7 - the arrow facing forwards is redo
8 - the cloud icon is for uploading animations or drawings
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Hope this was helpful