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.
First off, I would suggest to check your Dropbox Integration Folder Names, here's a guide: Upload to Dropbox with JotForm
Second, Dropbox Integration has limits, make sure not to bypass this to avoid missing files.
1. Upload not more than 10 files on the form. Dropbox only accepts a maximum of 10 uploaded files. If the user uploaded more than that, they will not be forwarded to your Dropbox account.
2. Maximum file size is 150MB. Please do not exceed this limit.
I have also uploaded a test file to your form, please check it on your end.
If you continue to have this problem, you may want to try Box Integration. This is almost similar to Dropbox but this has no limits on the number of uploaded files. JotForm now Integrates with Box.