Welcome to the forum, @jbinpg. Are you using inaturalist.org/observations/upload ? You can combine multiple photos into on observation by either selecting them and clicking on “Combine” or by dragging and dropping one photo into another. Please see the tutorial video here: https://www.inaturalist.org/pages/video+tutorials#add_web
If you continue to have problems, please share any relevant URLs and screenshots. Here are instructions for how to take a screenshot on several types of devices: https://www.take-a-screenshot.org