Files with same URL don’t update, app sucks

Seeing a bug with this application. When we delete a file and upload a new version that had the same file name, the old version still displays, even after flushing the cache. This only occurs with files uploaded to FileBird, if uploaded to the traditional WP media folder the behavior doesn’t occur. In other words, we uploaded a filed called XYZ.pdf. Deleted it, then uploaded a new version called XYZ.pdf (same file name), but the old version keeps displaying, even after we clear the cache. Only occurs with FileBird. On other sites where FileBird isn’t loaded and we use the traditional WordPress media folder the files update fine. We need to keep the same file name because we need to keep the same URL for other applications. Tried to submit a support ticket and get a continuous loop to verify our purchase.