Reply to neil:
This is how I do it:
1. Reply to thread (or start a new one)
2. Click on Attach button (paper clip) which opens File Upload Manager
3. Drag an existing picture to the Attachments pane, or Add a new file which will automatically include it in the Attachments pane
4. Click Insert Inline button (should have a number corresponding the the # of pictures in the Attachment pane
5. Click Done
6. Separate each attachment entry with a blank line, including from the text surrounding the pictures (makes it easier to view the thumbnails
7. Click Preview Post to check it looks ok (you can click on a thumbnail to expand it)
8. Click Submit Reply
If clicking on the pictures does not open them in a new window at a larger size, your uploaded pictures might be too small
Not sure this is what you are looking for - the following is what I do.
My original files are huge -- 5184 pixels ( 72 inches) x 3456 pixels (48 inches) at 72 pixels per inch.
I typically use Adobe Photoshop to add my watermark, captions and then export to desktop or a file. I export at 50% ( Traynham Ranch Show for example). This results in files of 2592 pixels x 1728 pixels and file size of 3 mb.
Some sites limit or restrict sizes of photos. One site I have used restricts to 1024 x 768 pixels and 72 dpi ( dots per inch)
Usually, the larger the picture, the greater the dpi for top quality, the web does not require high dpi as you would for printing purposes. Low dpi and large print size usually result in grainy appearances when printing.
Every program ( applications) works differently, however you should be able to resize your pictures to the sites requirements.
Once in a file or on desktop, use the "attach" (paper clip), a pop up box will appear - choose from Computer and the file, choose your photo and upload.
You will have to upload each file ( picture) individually. (Keep track of what you have uploaded, it is so easy to make multiples!)
You can always edit the posting to remove or add a photo.
Best of luck, hope this helps.
CTS