According to the File Attachments documentation:
https://help.quickbase.com/api-guide/filemanagement.html there's a VID parameter. You could create a series of API_EditRecord commands combined together to clear version 1, then 2, then 3 (since most file attachment fields only contain three revisions). If you'd like to see how to trigger a series of API calls together in a single button click, please watch the "API Button to Create a Series of Records" section of my advanced formulas course here:
https://university.quickbase.com/series/app-building/advanced-use-of-formulas
