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Could you please indicate if you ares still having issues integrating your form with dropbox? I was able to integrate successfully a form to dropbox with no problems. Please verify that the credential to dropbox are correct.
Sorry for this inconvenience. Since you indicated that some of the forms were able to integrate properly, could you please indicate which forms are having this problem.
If you were able to integrate some of your forms, all the forms should have no problems.
Please indicate the forms with problems so we can analyze it better.