An app crash most likely happens due to memory issues.
When your painting starts to feel slower and mode change starts taking some seconds - that are usually the first signs that your iPad is running low on memory.
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Do you paint a lot in a single layer? Do you have a lot of eraser used in a single layer?
Many paint and/or eraser strokes need a lot of resources. -
Do you have big imported jpg/png files?
2000 x 2000 pixels and smaller is recommended for png files. A jpg. can get slightly bigger.
So far - exporting animations only works with external software or hardware.
best,
mat