If you are uploading these to your INGO album or even leaving the option checked to have it "Retrieve remote file and reference locally" when referencing a picture at a URL you are going against a very small quota that INGO provides for pictures, and you have exceeded it. In the latter case uncheck the box and it won't pull the picture to your INGO storage. If you are uploading to your INGO album for use, pick a photo upload/sharing service such as Imgur, etc and use that instead and then just reference the URL of the picture on that service to post it to INGO.
There are some tutorials floating around on INGO about posting pictures.