When a user signs on to my app using Auth0 DropBox social media, are they granting my app permissions to push content to their drop box folder for my app?
If so, how to I get the necessary drop box access token?
When you configure the Dropbox connection you will as part of the process indicate the type of access you intend to grant to the application so the level of access will depend on how you configured the connection. For reference, see: https://auth0.com/docs/connections/social/dropbox
In addition, you may to also read the following general documentation about access tokens associated with external identity providers: https://auth0.com/docs/tokens/idp