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.
once you publish your form, will be available to access from any computer connected to internet also the upload fields.
In order to find out what could be happening with the Netherlands user, please check this 2 items:
Max File Size Limit
Ask the user about the size of the file that it is trying to upload, if it is bigger than 1MB, this could be the reason why he can't upload the file, you can increase the Max file size limit.
Check if the file extension of the user file is within the allowed file extension of your upload field options, if not you can add a new one.
Hope it helps
please let us know if you need further assistance