Copy and paste font remains the same

I send out a newsletter/blog post every Friday, have done so for many years. Today I had to migrate off the "legacy" email platform and use the new platform. On prior platform I could write my update in Word and then just copy and paste into appropriate section on the Constant Contact template and my formatting remained. As well, I could drop my image (a chart that changes weekly into the copy). On new platform when I paste my copy it converts to whatever is pre-set, which is a pain since some of my copy is different size font, and I can't drag and drop my image. Now I need four steps, before I needed two, to complete the copy. Went from about 1 minute to complete my update every Friday to 5+.