There are different ways of posting images on UL.

I use two methods using Picamatic

A) First method

1. Upload image to Picamatic
2. Select and copy this link

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3. Paste whole link into UL.

This will give an image that expands if clicked on

Result example

B) Second method

1. Upload image to Picamatic
2. Select and copy this link:

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3. Go to UL Page
Left click on Insert/Edit image Icon top left of window

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Then Paste in link from Picamatic into the URL field in the pop-up.

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Click OK

This will give an non expandable image.
Here is an example

Good for smaller images