@LeonidS @Anton L @Alex T⚜️ @Alexey I've tracked this issue to the fact you are uploading the web capture as a blob, and I'm not sure I can check duration at this point.

So, I need help understanding the form classes. How do I handle the same check at submit, and if too long, send the error message to the correct place, and the form placed in error mode (error message by submit button, my custom error message by video uploaded)?

I can't find any good demo or explanation of the error handler.

Thank you for your time.