It is not a maximum upload size problem.
The error comes from the outside of the component. I just tried to upload different pictures and sometimes there is a network error on upload. See the picture https://postimg.cc/cKYMdh54.
This is something that the component cannot control and throws an error because of the not uploaded picture. To ensure that our component works as expected you can try it on our server here:
https://playground.norrnext.com/administrator/
login: demoadmin,
pass: demoadmin
Try to upload different pictures with different sizes. There will be no error.
Kind regards,
Dmitrijs