by GreenLake » Wed Dec 02, 2020 6:00 pm
You are correct. When you use the "img" tag from the buttons above the edit field, the string that goes between the two tags needs to be a URL that resolves to an image file. Unfortunately, using the link you show DropBox does not serve an image, but a web page with an image on it. That's not something the forum software can embed. You can test any link by pasting it into the address bar of your browser. If it opens just an image, the link is good. (It also must end in an extension, like .jpg, that the forum software recognizes as an image).
There are photosharing sites that allow deep linking (linking to "just" and image).
A link has the advantage that you don't get the size restrictions the forum imposes. But if you can compress your image to reduce file size, and also scale the pixel dimensions to something that fits a browser window, but not so small that it becomes a postage stamp, (I use ~1200 for the width) then you can use the "Upload Attachment" feature (below the edit window).
For the forum, the advantage of an attachment is that it's hosted here, and won't "disappear" some day in the future, if someone loses an external picture hosting account or deletes an external picture without realizing it was shared here. To me, that's worth the slight hassle of prepping pictures for upload.
Now, if you have really large sets of pictures (e.g. many, many detail shots from some project, or from surveying your new boat), then a link to some external folder with image might be preferable. But if it's something that you think some other new owner, coming a few years after you might like to be able to see, then I'd upload it here.
~ green ~ lake ~ ~