Image resizing in e-mail template in Campaigns

I know we can create the email template and then attach it in the campaign, but when we create the model directly in the campaign, when inserting a large image, even resizing the view remains large, although in the send it is normal and go resized according to editing, during construction it is very difficult. Iā€™m posting here because I have no time to research if it is a known problem, otherwise I would create a call in GitHub, because I already tested in the demonstration and the same thing happens.