@Talita Gonçalves try using refresh harness instead of refresh section

@Talita Gonçalves  Put the attachment display and your button in a small, named section of their own, and drive that section from a data page that lists attachments with “Reload if older than 0 seconds” so it always pulls the latest. Save-as the attachment flow action you use (pyAttachContent or pyAttachFile) and on the modal’s Submit add a post-action of Refresh other section targeting that named section; if your layout is simple, Refresh harness also works. If you cannot modify the modal, replace the upload with a File Input control and configure On change to run your attach activity, then Refresh other section. In Constellation, open the view that hosts the button and add an event handler for Case updated or After save to Refresh view so the platform refreshes the moment the modal finishes. Avoid “Refresh this section” on a static layout that has no event source. Finally, make sure your section reads from the attachment data page or pxLinkedRefTo list, not a cached clipboard page, so the refresh actually shows the new file.