Changed max file size to 1GB

i have changed the max file size to i gb but its not getting refleted under teh upload button, it still shows 300 mb

1GB is the max upload size for JotForm. This applies to the Single File Upload field.

Now, if you enable Multiple File Upload, the max file size is capped at 100MB for each upload.

Also, the file upload limit won't appear under the File Upload's label unless you explicitly added it. Can you provide a screenshot of it so we can check?

Here's a guide on hHow-to-Post-Screenshots-to-Our-Support-Forum.