When you create a thread on this forum, adding images to help explain your issue can go a long way. As they say, an image is worth a thousand words. For readability the best way to do this is to DRAG & DROPstraight into theTEXT WINDOW.
This will place your imageINLINE. You can alsoPASTE(ctrl / cmd + v) images from your clipboard straight into the text window as well or use theINSERT PHOTOSbutton.
If need be you can move the image to position it at a suitable point within your text, ideally following any references to it. They can also be scaled in size, though unless you are showing a close crop of something small, this is not needed as clicking on the image will expand it out anyway.
The attachment box at the bottom should only be used for sharing objects and files.