The best method is to upload multiple images, even if you are only uploading one.
Using this method includes the properties with the image. If properties are missing, the image may not appear.
Inside the Text Block, click the Image Icon
Click "New..." to Upload a new image (one that isn't already in the Image Gallery).
The target site shows where your image will be uploaded. You can change the location if you want the image in a different area.
Click the "Browse" button.
Find the image that you have sized and saved to your desktop. Highlight it and click "Open."
If the "Image Size:" shows up as "(unknown)" click the "Rescan Image Size" button.
Double check your Alternate Image Text (Flyover Text) to make sure there is a good description for people using screen readers on their computers. Then click "Save."
Once you've uploaded and placed your new image, you can edit it later.