Very important, all shares can be modified after you have sent the mail. No worries that you accidentally gave a receiver the option to download the original master file. Just go to the“User options” menu, and here you can modify all permissions. You do not need to re-sent the link; just ask the receivers to refresh the browser where the link is.
Click on the arrow to open the User options menu
Here you can see what options are enabled and how many logins there have been. Two checkboxes are important for notifications.
"Send Email Notifications to Viewer" This will send an email notification every time a new file is added to the shared folder or comments are made on the share links.
"Send Email Notifications to Viewer" Deselect this, and the sender will no receive any notification emails.