I am running several sites hosted on wpengine.com - all using WP Smush Pro.
On some of these sites, WP Smush works as expected.
On others, it does not work as expected. The specific problem there: After uploading images, I can see a notice by WP Smush saying something like "WP Smush | Reduced by 57.93 KB ( 45.0% )" with the image in the media gallery. However, the file size of the images stays the same, i.e. there is no reduction.
I asked WPengine support, but their first answer was not helpful. They suggested to ask you.
I did some research and found advice like disabling object caching, disabling or enabling CDN (I don't use it in general).
I tried resetting file permissions in my WP Engine account. My suspicion is/was: the image is sent to WPMU compression server, but the optimized version could not be fetched / re-uploaded again.
I tried deactivating and re-installing both WPMU Dashboard, the WP Smush Plugin, trying to install Smush via WPMU Dash, trying to install Smush via Wordpress Plugin Repository etc.
I tried to "re-login" with my WPMU Dashboard, clicking on "Manage" and then "Edit" next to my WPMU API Key.
Nothing worked by now.
Any idea or typical thing with WP Smush at wpengine.com, that could help?
PS: Is this ticket public in any forum, or is it private to WPMU support only? I don't want to post my domains/sites in public forums.
Thanks + best regards,