To open an existing spreadsheet from other cloud drives: 

1. Go to Places using the option in the bottom bar of the file listing page.

2. Choose the desired place from which you wish to open the file. For Dropbox and Box, you will need to authenticate your account.

3. Pick the spreadsheet file to open.
   

4. ​Tap the Save button to save the changes to the original file, save a copy in your Zoho Sheet account, or export the file after editing.