how can i disable File property on form

Hi HKhan

This can be achieved using below code (Use this method in onformpopulate event) 

Before Change

Using Below Code (Entire element will be disabled)

const displayName = document.getElementsByName('native_file')[0];
if(somecondition)
{
displayName.style.display = 'none';
}
else
{
displayName.style.display = 'inline';
}

Using Below Code (Label will display but only upload will be hidden)

const fileItem = document.getElementsByName('native_file')[1];
if(somecondition)
{
fileItem.style.display = 'none';
}
else
{
fileItem.style.display = 'inline';
}