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I will look for that and try it! Thank you! :)

What kind of files do you use for images? jpg, png,... & what resolution/size?
I use jpg but all rescaled to maximum 1000px width... never had a problem...

When I edit my images, I scale them to 1600 x 900 pixels, and save them as JPG files. I also tried uploading them THREE different ways — click-to-upload, drag-and-drop, and insert image from the HTML editor. I've also tried with text above the pic, no text above the pic, but it's always the same. Perhaps I need to scale the pics down more, that's a thought. Thanks!