When you take a photograph with a digital camera it adds an EXIF mark-up to the image file indicating the top and bottom of the photograph. When the camera is held upside-down, the mark-up adapts itself accordingly i.e. depending on which way the camera was held.
When the system creates a thumbnail of your photograph (when you upload it to your application file), the EXIF mark-up is not taken into account i.e. if the camera was held upside-down when taking the photo, the thumbnail also displays the photo upside-down.
This is also true if the camera was held at 90° (in any direction) when taking the picture.
If you really want the thumbnail to be displayed in the same direction as your photograph then you must edit your original photograph so that it is displayed in the right direction once the EXIF mark-up has been deleted. You could use Photoshop or similar image-editing software to do this. Once you have re-created the original photograph, you can delete the old one from your application file and replace it with your new photograph. A new thumbnail will be created. If the thumbnail is still upside-down then something has not been properly edited or the EXIF mark-up was not correctly removed when you edited the photograph with your software.
You can find more information about this online. You will find different responses based on your type of computer and the image-editing software you use.
Bear in mind that these thumbnails are only created so that you can remember which photographs you uploaded to your application file. They are only there for you. The jury does not look at these thumbnails; it only examines the original unmodified photographs uploaded to your application file.