You might try the stickies in the help section on posting pictures.
https://www.quiltingboard.com/qb-help-center-f27/
For me with my setup and old school digital camera, I have to click Go Advanced to download images that I have reduced using the defaults on this site:
https://www.reduceimages.com/
Once you get the images on your list, you have to widen the window to the far top right to see/press the upload button. I've never been able to get the paper clip to work for me, and I haven't really tried to embed images into my text since the board format changed.