I’ve just done a test with the plugins you listed installed and active and I’m not seeing the problem that you say your having.
Try switching to one of the 20XX WP themes. Also try deactivating those other plugins, it could still be something to do with them that I’m not seeing.
Attaching images to a topic. At the lower left of this window is a paper clip icon. Clicking on this will allow you to attach many types of files, including images.
Importing. ACF5 Pro includes an import tool. ACF5 Pro is a premium version of the ACF plugin available on the WP repo.
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