You are able to export JPGs and PNGs from within Over. These are also the only file formats that can be opened within the app, when it comes to images or graphic files.
That said, we’d love to add more options for our users to select from. Please feel free to send us a feature request via email to firstname.lastname@example.org of the type of file format you’re looking to use or export. We’d really appreciate the feedback - thanks!