Hello,
This issue connected with your hosting, it blocks upload of images.
You need contact your host provider and explain error, which you have.
For that open console and check. There must be - Internal server error.
You can also give us admin access and we will say what exactly error you need to show your hosting provider.
admin access You can send to our contact form.
ordasoft.com/contact-us-form
Best Wishes,
Taras
OrdaSoft team