Emulator External Storage
This is a quick guide to help resolve external storage errors when using an emulator.
If you are receiving this error:
It means that the storage is unmounted.
Follow these steps to resolve this issue.
1) Open settings in the emulator and click SD card & phone storage
2) Click Mount SD card
3) When it finishes the screen will look like the following
4) Start the Blocks Editor (restart it if it’s already open) and you should no longer get that error.