The default browser spell check does not work when using Multiple-paragraph text, is there a fix for this? I make a lot of spelling errors and they are not caught 
Hello @DatoUser
There is no native “passthrough” of the browser spell check on multi-paragraph fields.
You can however install this plugin TinyMCE Editor - Plugins - DatoCMS that will allow you to customise your multi paragraph field, including adding a spell checker of your choice for it.