Hi Linkness_web,
I've tried to upload images as you've done : it's working for jpg, png but not for jpeg images.
Go into global configuration and check the media's field "Legal Image Extensions (File Types)".
If the problem doesn't come from the image(s) extension, it could probably come from the storage syntaxt.
To verify it, follow the group X extension manual.
If you still have problems, come back to us with screenshots of your content types views and fields.
Good continuation,
Ness