That's not currently possible. The team is always working on adding new connectors to this list, however, so keep watching for updates.
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Tableau Prep Builder connectors for Google Drive or Dropbox are not currently built into the product.
A full list of supported data sources, are available on Tableau Prep Tech Specs page below.
A possible alternative to connect Tableau Prep Builder to a data-source not listed is to use the use the new ODBC implementation, introduced starting with version 2019.2.2 and later.
Practically, using ODBC connector on Tableau Prep Builder, you can connect to any data source using the Other Databases (ODBC) connector that supports the SQL standard and implements the ODBC API. Connecting to data using the Other Databases (ODBC) connector works similarly to how you might use it in Tableau Desktop, however there are a few differences. For more information, please refer to the help article below.
Additionally, the article below provide more information on the new ODBC connector.
Hope this helps!
Jonathan Drummey wrote:
FYI here are two feature requests for cloud connectors:
https://community.tableau.com/ideas/9691 (for Google Drive, OneDrive, Dropbox)
https://community.tableau.com/ideas/8822 (explicitly for Box)
Yeyner Escobar please feel free to add your votes & comments to the Ideas Jonathan has linked to. Our Dev team regularly reviews the Ideas board as they design the product roadmap for new features.
[Program Manager | Tableau Community Forums]