If you’re unable to upload an image on WordPress 4.3 and got this error ‘ An error occurred in the upload. Please try again later.‘, instead of disabling all the plugins or the each plugin one by one or reinstalling WordPress, we’ve a simple fix for you for this.
Fix WordPress 4.3’s ‘An Error occurred in the upload. Please try again later’
1. If you’re writing a new post, immediately save it as a draft and try to upload the image again to see it works.
2. If you’re updating an old post, click on ‘Update’ button, and try to insert the image into the post again, this time it works, as it did for us.