Storing small PDF files inside the DB?

Hello everyone, I know about GridFS and the limit of 16MB, and that the usual practice is to store them on a filesystem solution. But my use-case a bit differs, we upload a small number of documents (probably around 30) with the size of 2-3MB max, so all in all in a couple of years this will only go as far as 500MB. And managing an S3 instance for this might not be the way to go. Would in this case make sense to go for Mongodb as its my primary database already? How easy is it to read/ write to the DB with Pdf file contents? Also how easy would it be to migrate the files to S3 later on if necessary?

Thank you for your time!