Yes, it has been accepting pasting anything you copy in your clipboard for a while now (it didn’t used to). That makes it easy to copy an image from anywhere, including from your computer and paste here. this is online, a simple copy and paste
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Previously (and if they restrict it again), you had to know how to paste the address of an image that was already online,
1st, pick an online image, anywhere, right click it and ’copy image address’ (it’s url)
2. in your post here, top bar, click 6th icon from left, ’image’.
dialog box opens, waiting for you to paste the image’s url
bingo, it appears. you can name it anything in the ’alternative text’ box
lately, they come in distorted when I use this method, this is the same image that I simply copied and pasted above