Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to use your android as a portable hard drive [title] Buy a microsd card. [step] Only do this step if your phone has a microsd card slot for storage expansion. The memory card acts as the external memory so that the files aren't mixed with the folders that are essential for some of your apps to function.

Ending1: [substeps] You can purchase an adapter with a back switch or plug it into your phone for use in some other methods. Instead of a battery, it will be known as a hard drive. Ending2: When you're carrying a frozen android, you should get a microsd card. [substeps] If you downloaded the software in the previous step, opt for one that contains the following steps: connect your android device to your computer using the usb cable that came with it. Ending3: [substeps] Head to your favorite online store or computer/cell phone accessory store and purchase a microsd card. The maximum capacity depends on how much your phone can handle (flagship phones usually take up to 64 gb of expanded storage). Ending4: Don't forget to leave space at the bottom of the tray for the record you want to forward. [title] Add video to the sd card tray.

Answer format: ending1/ending2/ending3/ending4