64GB internal storage isn't the largest on the market but should do fine for most people. It supports memory cards of the microSD type.
From Amazon
CUBOT Max 3 Dual SIM 64GB 4GB RAM Green
ShopBetter24
Smartphone Cubot MAX3BLACK Black 4 GB RAM 64 GB 64GB 6.95"
Shopaide
Smartphone Cubot MAX3BLACK Black 4 GB RAM 64 GB 64GB 6.95"