I understand that I can create an html text document and get it to display in a
dynamic text box via creating a button to call it. I am more interested in
getting my html text or text document into my text box without the push of a
button. Is there a way I can do this as the movie loads or other options?
Thanks.

you can assign text (html or not) to a textfield any number of ways including
assignment of text when a frame loads. for example, attached to frame 1 of the
timeline that contains your textfield with instance name tbox:

tbox.htmlText="this is your text";