The Cinera features two USB ports at the top: One standard USB A port and a micro USB port (that also doubles as on OTG port).
Should you wish to connect two USB A plugs at the same time (for example, a USB flash drive and a mouse), there is a simple solution: An OTG USB A adapter. This adapter allows you to use the OTG port to connect any standard USB flash drive or card reader while the Cinera's USB A port is being used by a mouse or other peripheral device.
Such OTG adapters can be found at very low cost on eBay - in some cases, less than US$1.50 for a pack of ten. As an example, here is one such listing. There are many more.