Dear UWERA Rosy, thank you for your contributions to OSM. It would be great if you could separate out the hashtags and image source into the fields where they belong. Your changeset comment should be simply "Mapped buildings in Goma in DRC"; any hashtags you want to add go in the "hashtags" input field, and if you want to specify an image source that goes into the "source" field. Thank you for aiming the changeset description at actual humans ;)