Yes, it's possible to disable the upload button. Please check the Editor.AllowUpload Property which specifies whether the user accessing the page has permissions to upload images.
You can do something as following:
When the users is logged in, you can get her/his access role. If he/she is admin, we can set bool isAdmin to true.
if (isAdmin)
{
editor1.AllowUpload =true;
}
else
{
editor1.AllowUpload =false;
}
Keep me posted.
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