To upload in a comment you need to put the pic somewhere so you can copy the web address.
I use Google Photos, as my phone is already connected. I just have to go to photos.google.com and my most recent pic (selfie I just took) is there. Click on it to view THEN right-click and copy image address. Then you'll need to paste it in here with the the markdown code for a picture.
Pictures in markdown:

You don't NEED a title, but DO leave in the brackets.
You can also upload images to Imgur and get a link that way.
To upload in a comment you need to put the pic somewhere so you can copy the web address.
I use Google Photos, as my phone is already connected. I just have to go to photos.google.com and my most recent pic (selfie I just took) is there. Click on it to view THEN right-click and copy image address. Then you'll need to paste it in here with the the markdown code for a picture.
Pictures in markdown:

You don't NEED a title, but DO leave in the brackets.
You can also upload images to Imgur and get a link that way.
Good luck!
You start a Post.
You upload the image clicking on "selecting them":
Insert images by dragging & dropping, pasting from the clipboard, or by selecting them.
You copy the code and you paste it in your reply.