When I want to upload a photo to my article with the button to add a multimedia file, after uploading, when I click on the option to put it in the post. In the browser console wp-admin / admin-ajax.php gives a 404 error and no image is added to the post.
jquery.min.js?ver=3.5.1:2 POST wp-admin/admin-ajax.php 404 (Not Found) send @ jquery.min.js?ver=3.5.1:2 ajax @ jquery.min.js?ver=3.5.1:2 s.ajax.s.ajax @ jquery-migrate.min.js?ver=3.3.2:2 (anonymous) @ wp-util.min.js?ver=5.6:2 s.Deferred.s.Deferred @ jquery-migrate.min.js?ver=3.3.2:2 send @ wp-util.min.js?ver=5.6:2 post @ wp-util.min.js?ver=5.6:2 attachment @ media-editor.min.js?ver=5.6:2 (anonymous) @ backend.min.js?ver=6.0.3:10 (anonymous) @ backend.min.js?ver=6.0.3:10 c @ jquery.min.js?ver=3.5.1:2 fireWith @ jquery.min.js?ver=3.5.1:2 l @ jquery.min.js?ver=3.5.1:2 (anonymous) @ jquery.min.js?ver=3.5.1:2 load (async) send @ jquery.min.js?ver=3.5.1:2 ajax @ jquery.min.js?ver=3.5.1:2 s.ajax.s.ajax @ jquery-migrate.min.js?ver=3.3.2:2 processImages @ backend.min.js?ver=6.0.3:10 media.editor.send.attachment @ backend.min.js?ver=6.0.3:10 (anonymous) @ media-editor.min.js?ver=5.6:2 (anonymous) @ underscore.min.js?ver=1.8.3:2 v.map.v.collect @ underscore.min.js?ver=1.8.3:2 (anonymous) @ backbone.min.js?ver=1.4.0:2 (anonymous) @ media-editor.min.js?ver=5.6:2 p @ backbone.min.js?ver=1.4.0:2 f @ backbone.min.js?ver=1.4.0:2 l @ backbone.min.js?ver=1.4.0:2 n.trigger @ backbone.min.js?ver=1.4.0:2 _onModelEvent @ backbone.min.js?ver=1.4.0:2 p @ backbone.min.js?ver=1.4.0:2 f @ backbone.min.js?ver=1.4.0:2 l @ backbone.min.js?ver=1.4.0:2 n.trigger @ backbone.min.js?ver=1.4.0:2 click @ media-views.min.js?ver=5.6:2 click @ media-views.min.js?ver=5.6:2 dispatch @ jquery.min.js?ver=3.5.1:2 v.handle @ jquery.min.js?ver=3.5.1:2
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Answer
My problem was solved by disabling mod_security.
<IfModule mod_security.c> SecFilterEngine Off SecFilterScanPOST Off </IfModule>
Add this to the end of htaccess.