When you follow a case, DocketBird will check the docket sheet twice a day, and will send you an email when new filings have occurred.
To keep your PACER fees to a minimum, DocketBird will not automatically download newly filed documents. Instead, DocketBird will merely inform you of the new filings, and will provide you a link so that you can easily download them if you like.
Generally, if you are an attorney of record on a case, you should not be using the "follow" feature for that case. Instead, you should set up your ECF Free Looks with DocketBird. That will ensure that DocketBird can automatically download new case filings for free, and email them to you as PDF attachments.