How can I setup file upload upon submitting the form

How can I setup file upload at the end of the form.  I would like to "submit form"(Prześlij in this case) button  began sending files. because now it is done right after  selecting the files.

I'm afraid that this is the feature of multiple file upload.

If you switch to a single file upload, it will submit the file only after you've clicked on the Submit button.

When you are uploading multiple files, it is best to start uploading files as soon as they are selected, so that when you actually submit the form there is least possible chance for anything going wrong with the uploads - you avoid connection timeouts and similar. With multiple file uploads, it is also helpful to see the error sooner, rather then only upon submitting a form.

However, you can enable your users to upload even multiple files when they find it most convenient by using our Image Upload Preview widget:

Here is a guide on how to add widgets to your form: http://www.jotform.com/help/252-How-to-Add-a-Widget-to-your-Form

Once added, this widget would allow your customers to add multiple files, and upload them only upon clicking on the Begin Upload button.

Please let us know how it goes, or if you need any further help in setting it up, and we will be glad to assist you.