This is an ongoing issue with the build we use for one of our sites, v2.7.3.
Posts won't upload (or save changes at all) if there is an image attached. The post will upload as long as I do not attach an image, but then even if I try to attach the image once uploaded the change just won't take.
I don't know if it is related, but posts also won't appear at the top of list unless they are backdated in the 'publication date' box, which can be frustrating but at least there is a workaround.
I don't have the correct access to update the build or mess around with admin settings, so will have to put in a request to modify anything like that.
Many thanks in advance