Facebook Error! (#105) param child_attachments has too many elements.

This error is related to the size of the images or videos that you have uploaded in your static campaign and means that the images or videos you have uploaded are more than 5MB or 20MB, respectively. To avoid this error, we recommend using JPG or PNG images (up to 5MB) and GIF, MOV, or MP4 videos (up to 20MB) for the best results.