I have received quite a few messages saying that they have problem with adding more tapioca flour to the mixture than the recipe asked for. Since I was making this to give to my mom and relatives just two weeks ago, I have taken some step-by-step picture for your reference.
Steamed sweet potato and mashed it with some pandan paste.
Add in 150g of tapioca flour.
Mix it well into the mashed sweet potato.
After mixing in the tapioca flour, this is what I have got of the dough, ready to be used to wrap with the filling.
I wrapped some with chopped gula meleka and some with coconut filling.
You can see from my pictures that after adding 150g of flour, the texture was just right for wrapping. I did not need to add more water or more flour. If your mixture turns out too wet, add more flour but should not be too much. If too dry, add more water, a little at a time.