What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
The issue you describe must be a glitch from your side only as I try integrating my form with Dropbox and Box and I had no issues.
Could you please provide further information about the issue you are getting at the time of building the integration? Does it gives you any error message?
It is possible that the cause is related to the browser you are using and that's why you cannot complete the integration, we recommend to use Chrome browser to create yoru forms.
We will wait for your reply to give you further assistance.