Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
If you add content to a Publisher page, it does not 'push down' the content below like in Word. If you add more text than can be displayed in a text box you have to either enlarge the text box or link it to another text box. And if you lengthen a text box then you have to manually move everything below it to make room including a 'footer grahphic', or in other words move the 'picture box' down to make room for the additional text.
One option you could consider is to insert your footer image 'inline' in a text box. It will then move with text within that text box much as it would in Word.
Web pages templates are by default very long because when you convert them to html Publisher will automatically truncate the page after the last design element creating a custom length page. I don't have Outlook 2010 installed so I cannot test this but given that the email templates are also longer than you will probably ever use at 66 inches, I think they are also truncated after the last design element on the page when they are sent as a html formatted email message in the body of the email. They certainly are truncated if you convert them to html. However if you convert the email template to a pdf file it produces a page 66 inches long. So if you are using the email template and want to convert to pdf you would want to change the length of the page after you have finished the design and page layout and before you converted it to pdf.
Bottom line is if you want everything to be automatically pushed down on a page then you should probably stick with Word. Publisher is better at page layout but you have to move the design elements around manually.
DavidF