[Solved] Can not add attachment

Please make sure all wpDiscuz addons are disabled.

Then delete all caches and delete website optimizer/minifier plugin caches.

Then disable security plugins for testing purpose. As far as i see your website security plugins doesn't allow using WordPress ajax system. This is very bad.

I disabled all Plugins, only wpDiscuz active.

Have no minifier, no cache.

File permissions are correct.

Server did not block.

Any other idea?

No error in logfile.

I can call GET /wp-admin/admin-ajax.php?... with some params and export some Settings from an other plugin, so access of admin-ajax.php is possible.

php 7.3

Can be closed.

Problem was http in home url instead of https. 🤪