Here is how
1. Click the pic icon
2. find the picture you want to post (this has to be online), and right click, select Copy Image Location
3. select 图像 URL in the opened picture insert window, paste what you just copied
Here is the sample:
1. Click the pic icon
2. find the picture you want to post (this has to be online), and right click, select Copy Image Location
3. select 图像 URL in the opened picture insert window, paste what you just copied
Here is the sample: