It probably best to forget about Dropbox, Photobucket, Google Photos etc. Just upload your pictures directly to the forum using Manage Attachments. Do that first. Then start typing your post. When you want to insert a pic, use the paperclip icon in the menu bar and choose which of your already uploaded pics you want.

If linking a pic from another site, use the Insert Image icon in the menu bar. It will appear full size, but the others using paperclip will be thumb size. However, clicking expands them.


This the first picture



This is the second picture (it was a thumbnail to start with!)



Link using Insert Image icon:

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5