When you take a photo with your digital camera, the camera embeds a tag in the image file, called EXIF, which indicates where the top and bottom of the photo are. When the camera is held upside down while the photo is taken, the tag adjusts and indicates the top and bottom according to how the camera was held.
The same applies when the miniature thumbnail of the photo is created by the system at the moment you upload your photo to the application folder; the EXIF tag is not taken into account, so in cases where the camera was held upside down at the time the photo was taken, the thumbnail logically represents the photo incorrectly.
The same is true if the camera is held at 90° in one direction or the other at the time the photo is taken.
If for your personal visual comfort, you absolutely want the thumbnail to be oriented the same way as the photo, you must then edit your original photo so that it is represented in the correct orientation once the EXIF tag is removed. You can use Photoshop or any other photo editor to do this. Once your new original photo is created, you can delete the old one from your application folder and upload the new photo instead. A new thumbnail will be created. If the thumbnail is still not oriented correctly, it means that something has not been edited properly or that the EXIF tag has not been correctly removed when you edited the photo in your editor.
You can also search the internet for information on this topic. You will find different answers depending on the type of computer and image editing software you are using.
Note that these miniature thumbnails are created simply to help you remember what photo you have uploaded to your application folder. They are for your benefit only. The jury does not look at these thumbnails and in any case, it will only review your application with the original unmodified photos that have been uploaded to the folder.