I followed your directions in the video and created a custom theme for the ic_rounded which I named ic_rounded_headland. However, on the iCagenda > Themes, it is not displaying the thumbnail even though I did rename the thumbnail in the file. I get this message where the thumbnail should appear.
Edited section by Lyr!C:
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I cleared my browser cache, website cache both Site and Admin but no luck. The 'ic-date-div' does not show up.