Can’t back up website. Please help. Message: Dropbox Backup wasn’t created. Dropbox returned an error during file sending: “Invalid access token”(u)
1) Do you use our connection to Dropbox or your own App key and App secret? If the second, then make sure that you insert correct data.
2) Sometimes, during an update, an oauth token can become corrupt. In this case, the page refreshment or reconnection to Dropbox can help.