Where does upload form store uploaded images?

if I am using an upload form where do the uploads go? Can I change their destination?

There are different upload fields used to upload images to your form. Some that use cloud enable user to store files in cloud. For instance File Upload field in Jotform will upload your images to Jotform servers. Below is further information to File Upload forms.

https://www.jotform.com/help/332-How-to-Create-File-Upload-Forms

You can be able to transfer the images to your server buy either integrating your form submissions with Dropbox where submissions will be stored alongside the image in the specific submission folder.

https://www.jotform.com/dropbox/

The other option of transferring these images if by use of FTP server as shown below.

https://www.jotform.com/help/177-How-to-Send-Submission-Data-File-Upload-via-FTP