Can you tell me why this is not allowing me to add attachments application

Can you tell me why this is not allowing me to add attachments application. 

https://form.jotform.com/82286570185160

Greetings and thank you for your message.

The problem in your form is in the allowed file extensions:

Please do not add a dot before each extension. Your current list looks like this:

.jpg, .pdf, .png, .gif

and it should look like this:

jpg, pdf, png, gif

Please let us know if this has resolved your problem.