If you have an SD card mounted on your device, then you can easily read & write files to the SD card from Office on Android apps.
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On the Open page, tap This device.
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Tap SD Card or Documents (SD Card).
Notes:
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To save a file to SD card on your device, tap Save or Save as and select Documents (SD Card).
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Due to some limitations with Android, your app can only save to the folder Documents (SD Card), which is stored in SD card>Android>Data in SD card . You can use the shortcut from the Save page in Office for Android apps to save to this folder.
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