For best results, place the cursor in the editor where you want the image.
Then don't use the little button but use the large section for dropping in files for attachments: zips, images, .... any file can be attached
You might need to click the download button in the BB popup dialog for attachments.
Then when image file is registered (sometimes it doesn't take on first try) you have the option to insert it into the post, that probably only works for image files.
BTW most times you CAN click the smaller square image and get a full blown dialog screen for exploring image in separate browser tab.
Then don't use the little button but use the large section for dropping in files for attachments: zips, images, .... any file can be attached
You might need to click the download button in the BB popup dialog for attachments.
Then when image file is registered (sometimes it doesn't take on first try) you have the option to insert it into the post, that probably only works for image files.
BTW most times you CAN click the smaller square image and get a full blown dialog screen for exploring image in separate browser tab.
b = b + ...