What happens to ownership of the files?

The files from your shoot, the published text and the accounts belong to the venue, and you take them even when the month ends. What you do not take is a stock library from somewhere else, or an account the agency opened in its own name. Ask for it in writing before the shoot, not as you say goodbye. Check that the folder is on a drive of yours, not on a link that expires. It is assumed that paying the fee includes the raw files and the ad account. When you leave, you are handed a jpeg with a watermark.

Cristina Osuna delivers the shoot files to your folder, and Carlota Fermín’s calendar stays in your accounts. At the close there is nothing to negotiate about ownership: it was already yours.