I have a web application (ASP Classic) which uses DropZone and ASP Persist to upload files.
We were using jquery 2.1.1 and it works fine, but once we upgraded to jquery 3.1.1 we get the error below:
Persits.Upload.1 error '800a003d'
Wrong Content-Type. Make sure you have included the attribute ENCTYPE="multipart/form-data" in your form.
/bluedot_2018/Intranet/Contacts/attachments_add.asp, line 21
This is without making any other changes to the code. So evidently Jquery 3.1.1 doesn't support something that it did on version 2.1.1
Any help is greatly appreciated.