I am now receiving "Attachment data missing, request not processed by API" error trying to Send Smush Request. I have gone through sending and fetching 4002 of 5805 images. We use WP-Engine for hosting and I have disabled object/transient cache and purged CDN cache. I have already granted support access. I have also tried deactivating and reactivating the WP Smush Pro plugin with no success. Please help me rectify this issue so that I may complete bulk smushing of images. Thank you!